291286480 has 20 divisors (see below), whose sum is σ = 677241252. Its totient is φ = 116514560.

The previous prime is 291286451. The next prime is 291286487. The reversal of 291286480 is 84682192.

It can be written as a sum of positive squares in 2 ways, for example, as 90554256 + 200732224 = 9516^2 + 14168^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291286487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1820461 + ... + 1820620.

Almost surely, 2^291286480 is an apocalyptic number.

291286480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

291286480 is an abundant number, since it is smaller than the sum of its proper divisors (385954772).

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

291286480 is a wasteful number, since it uses less digits than its factorization.

291286480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3641094 (or 3641088 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 291286480 is about 17067.1169211440. The cubic root of 291286480 is about 662.8879265968.

The spelling of 291286480 in words is "two hundred ninety-one million, two hundred eighty-six thousand, four hundred eighty".