64574693640 has 96 divisors (see below), whose sum is σ = 217640666880. Its totient is φ = 17219915712.

The previous prime is 64574693639. The next prime is 64574693641. The reversal of 64574693640 is 4639647546.

It is a happy number.

64574693640 is a `hidden beast` number, since 6 + 4 + 574 + 6 + 9 + 3 + 64 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (64574693639) and next prime (64574693641).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (64574693641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3312024 + ... + 3331463.

It is an arithmetic number, because the mean of its divisors is an integer number (2267090280).

Almost surely, 2^64574693640 is an apocalyptic number.

64574693640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64574693640 is an abundant number, since it is smaller than the sum of its proper divisors (153065973240).

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

64574693640 is a wasteful number, since it uses less digits than its factorization.

64574693640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6643513 (or 6643497 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 54.

The spelling of 64574693640 in words is "sixty-four billion, five hundred seventy-four million, six hundred ninety-three thousand, six hundred forty".