64678436 has 24 divisors (see below), whose sum is σ = 115700760. Its totient is φ = 31629312.

The previous prime is 64678423. The next prime is 64678441. The reversal of 64678436 is 63487646.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 774400 + 63904036 = 880^2 + 7994^2 .

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, 33596 + ... + 35468.

It is an arithmetic number, because the mean of its divisors is an integer number (4820865).

Almost surely, 2^64678436 is an apocalyptic number.

It is an amenable number.

64678436 is a deficient number, since it is larger than the sum of its proper divisors (51022324).

64678436 is a wasteful number, since it uses less digits than its factorization.

64678436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2063 (or 2061 counting only the distinct ones).

The product of its digits is 580608, while the sum is 44.

The square root of 64678436 is about 8042.2904697605. The cubic root of 64678436 is about 401.4084432318.

The spelling of 64678436 in words is "sixty-four million, six hundred seventy-eight thousand, four hundred thirty-six".