64990260 has 144 divisors (see below), whose sum is σ = 214556160. Its totient is φ = 15863040.

The previous prime is 64990253. The next prime is 64990301. The reversal of 64990260 is 6209946.

64990260 is a `hidden beast` number, since 649 + 9 + 0 + 2 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 105714 + ... + 106326.

Almost surely, 2^64990260 is an apocalyptic number.

64990260 is a gapful number since it is divisible by the number (60) 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 64990260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107278080).

64990260 is an abundant number, since it is smaller than the sum of its proper divisors (149565900).

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

64990260 is a wasteful number, since it uses less digits than its factorization.

64990260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678 (or 673 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 64990260 is about 8061.6536765108. The cubic root of 64990260 is about 402.0524918460.

It can be divided in two parts, 649 and 90260, that added together give a palindrome (90909).

The spelling of 64990260 in words is "sixty-four million, nine hundred ninety thousand, two hundred sixty".