64012816 has 30 divisors (see below), whose sum is σ = 144275550. Its totient is φ = 27433728.

The previous prime is 64012811. The next prime is 64012829. The reversal of 64012816 is 61821046.

It can be written as a sum of positive squares in only one way, i.e., 61465600 + 2547216 = 7840^2 + 1596^2 .

It is a super-2 number, since 2×64012816² = 8195281224499712, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (64012811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40041 + ... + 41608.

It is an arithmetic number, because the mean of its divisors is an integer number (4809185).

Almost surely, 2^64012816 is an apocalyptic number.

It is an amenable number.

64012816 is an abundant number, since it is smaller than the sum of its proper divisors (80262734).

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

64012816 is a wasteful number, since it uses less digits than its factorization.

64012816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81671 (or 81658 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 64012816 is about 8000.8009599040. The cubic root of 64012816 is about 400.0266982180.

It can be divided in two parts, 640 and 12816, that added together give a square (13456 = 116²).

The spelling of 64012816 in words is "sixty-four million, twelve thousand, eight hundred sixteen".