64674440 has 16 divisors (see below), whose sum is σ = 145517580. Its totient is φ = 25869760.

The previous prime is 64674439. The next prime is 64674479. The reversal of 64674440 is 4447646.

It can be written as a sum of positive squares in 2 ways, for example, as 64673764 + 676 = 8042^2 + 26^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 64674440.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 808391 + ... + 808470.

Almost surely, 2^64674440 is an apocalyptic number.

It is an amenable number.

64674440 is an abundant number, since it is smaller than the sum of its proper divisors (80843140).

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

64674440 is a wasteful number, since it uses less digits than its factorization.

64674440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1616872 (or 1616868 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 35.

The square root of 64674440 is about 8042.0420292361. The cubic root of 64674440 is about 401.4001763798.

The spelling of 64674440 in words is "sixty-four million, six hundred seventy-four thousand, four hundred forty".