64518940 has 12 divisors (see below), whose sum is σ = 135489816. Its totient is φ = 25807568.

The previous prime is 64518899. The next prime is 64518943. The reversal of 64518940 is 4981546.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 64518940.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64518943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1612954 + ... + 1612993.

It is an arithmetic number, because the mean of its divisors is an integer number (11290818).

Almost surely, 2^64518940 is an apocalyptic number.

It is an amenable number.

64518940 is an abundant number, since it is smaller than the sum of its proper divisors (70970876).

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

64518940 is a wasteful number, since it uses less digits than its factorization.

64518940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3225956 (or 3225954 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 64518940 is about 8032.3682684498. The cubic root of 64518940 is about 401.0782160142.

The spelling of 64518940 in words is "sixty-four million, five hundred eighteen thousand, nine hundred forty".