64547740 has 24 divisors (see below), whose sum is σ = 137269440. Its totient is φ = 25491648.

The previous prime is 64547737. The next prime is 64547771. The reversal of 64547740 is 4774546.

It is a self number, because there is not a number n which added to its sum of digits gives 64547740.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18847 + ... + 22006.

It is an arithmetic number, because the mean of its divisors is an integer number (5719560).

Almost surely, 2^64547740 is an apocalyptic number.

It is an amenable number.

64547740 is an abundant number, since it is smaller than the sum of its proper divisors (72721700).

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

64547740 is a wasteful number, since it uses less digits than its factorization.

64547740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40941 (or 40939 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 37.

The square root of 64547740 is about 8034.1608149202. The cubic root of 64547740 is about 401.1378849751.

The spelling of 64547740 in words is "sixty-four million, five hundred forty-seven thousand, seven hundred forty".