64397740 has 24 divisors (see below), whose sum is σ = 147529872. Its totient is φ = 23417280.

The previous prime is 64397689. The next prime is 64397747. The reversal of 64397740 is 4779346.

It is a junction number, because it is equal to n+sod(n) for n = 64397693 and 64397702.

It is not an unprimeable number, because it can be changed into a prime (64397747) 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, 146139 + ... + 146578.

It is an arithmetic number, because the mean of its divisors is an integer number (6147078).

Almost surely, 2^64397740 is an apocalyptic number.

It is an amenable number.

64397740 is an abundant number, since it is smaller than the sum of its proper divisors (83132132).

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

64397740 is a wasteful number, since it uses less digits than its factorization.

64397740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292737 (or 292735 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 40.

The square root of 64397740 is about 8024.8202472080. The cubic root of 64397740 is about 400.8269143536.

The spelling of 64397740 in words is "sixty-four million, three hundred ninety-seven thousand, seven hundred forty".