290021280 has 96 divisors (see below), whose sum is σ = 921824064. Its totient is φ = 76640256.

The previous prime is 290021279. The next prime is 290021299. The reversal of 290021280 is 82120092.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×290021280² = 168224685705676800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 290021280.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51567 + ... + 56913.

It is an arithmetic number, because the mean of its divisors is an integer number (9602334).

Almost surely, 2^290021280 is an apocalyptic number.

290021280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 290021280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (460912032).

290021280 is an abundant number, since it is smaller than the sum of its proper divisors (631802784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

290021280 is a wasteful number, since it uses less digits than its factorization.

290021280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5478 (or 5470 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 290021280 is about 17030.0111567785. The cubic root of 290021280 is about 661.9267845876.

The spelling of 290021280 in words is "two hundred ninety million, twenty-one thousand, two hundred eighty".