64462640 has 160 divisors (see below), whose sum is σ = 179988480. Its totient is φ = 21196800.

The previous prime is 64462639. The next prime is 64462661. The reversal of 64462640 is 4626446.

It is a junction number, because it is equal to n+sod(n) for n = 64462597 and 64462606.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 463691 + ... + 463829.

It is an arithmetic number, because the mean of its divisors is an integer number (1124928).

Almost surely, 2^64462640 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 64462640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89994240).

64462640 is an abundant number, since it is smaller than the sum of its proper divisors (115525840).

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

64462640 is a wasteful number, since it uses less digits than its factorization.

64462640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211 (or 205 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 64462640 is about 8028.8629331930. The cubic root of 64462640 is about 400.9615201787.

The spelling of 64462640 in words is "sixty-four million, four hundred sixty-two thousand, six hundred forty".