64464140 has 24 divisors (see below), whose sum is σ = 145788720. Its totient is φ = 23802048.

The previous prime is 64464137. The next prime is 64464143. The reversal of 64464140 is 4146446.

It is an interprime number because it is at equal distance from previous prime (64464137) and next prime (64464143).

It is not an unprimeable number, because it can be changed into a prime (64464143) 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, 123710 + ... + 124229.

It is an arithmetic number, because the mean of its divisors is an integer number (6074530).

Almost surely, 2^64464140 is an apocalyptic number.

It is an amenable number.

64464140 is an abundant number, since it is smaller than the sum of its proper divisors (81324580).

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

64464140 is a wasteful number, since it uses less digits than its factorization.

64464140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247961 (or 247959 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 64464140 is about 8028.9563456280. The cubic root of 64464140 is about 400.9646301849.

The spelling of 64464140 in words is "sixty-four million, four hundred sixty-four thousand, one hundred forty".