64899072 has 144 divisors (see below), whose sum is σ = 214643520. Its totient is φ = 18505728.

The previous prime is 64899017. The next prime is 64899101. The reversal of 64899072 is 27099846.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×64899072² = 8423779092922368, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 128773 + ... + 129275.

It is an arithmetic number, because the mean of its divisors is an integer number (1490580).

Almost surely, 2^64899072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64899072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107321760).

64899072 is an abundant number, since it is smaller than the sum of its proper divisors (149744448).

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

64899072 is a wasteful number, since it uses less digits than its factorization.

64899072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538 (or 515 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 64899072 is about 8055.9960278044. The cubic root of 64899072 is about 401.8643635376.

The spelling of 64899072 in words is "sixty-four million, eight hundred ninety-nine thousand, seventy-two".