64604640 has 48 divisors (see below), whose sum is σ = 203506128. Its totient is φ = 17227776.

The previous prime is 64604623. The next prime is 64604647. The reversal of 64604640 is 4640646.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 64604598 and 64604607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64604647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66817 + ... + 67776.

It is an arithmetic number, because the mean of its divisors is an integer number (4239711).

Almost surely, 2^64604640 is an apocalyptic number.

64604640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64604640 is an abundant number, since it is smaller than the sum of its proper divisors (138901488).

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

64604640 is a wasteful number, since it uses less digits than its factorization.

64604640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134611 (or 134603 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 64604640 is about 8037.7011638901. The cubic root of 64604640 is about 401.2557204569.

The spelling of 64604640 in words is "sixty-four million, six hundred four thousand, six hundred forty".