64920136 has 16 divisors (see below), whose sum is σ = 122365440. Its totient is φ = 32289360.

The previous prime is 64920133. The next prime is 64920137. The reversal of 64920136 is 63102946.

It is a junction number, because it is equal to n+sod(n) for n = 64920098 and 64920107.

It is not an unprimeable number, because it can be changed into a prime (64920133) 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, 19716 + ... + 22771.

It is an arithmetic number, because the mean of its divisors is an integer number (7647840).

Almost surely, 2^64920136 is an apocalyptic number.

It is an amenable number.

64920136 is a deficient number, since it is larger than the sum of its proper divisors (57445304).

64920136 is a wasteful number, since it uses less digits than its factorization.

64920136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42684 (or 42680 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 64920136 is about 8057.3032709462. The cubic root of 64920136 is about 401.9078359380.

It can be divided in two parts, 64920 and 136, that added together give a palindrome (65056).

The spelling of 64920136 in words is "sixty-four million, nine hundred twenty thousand, one hundred thirty-six".