64890356 has 12 divisors (see below), whose sum is σ = 114055620. Its totient is φ = 32303040.

The previous prime is 64890349. The next prime is 64890359. The reversal of 64890356 is 65309846.

It can be written as a sum of positive squares in 2 ways, for example, as 48080356 + 16810000 = 6934^2 + 4100^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64890359) 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, 34505 + ... + 36336.

It is an arithmetic number, because the mean of its divisors is an integer number (9504635).

Almost surely, 2^64890356 is an apocalyptic number.

It is an amenable number.

64890356 is a deficient number, since it is larger than the sum of its proper divisors (49165264).

64890356 is a wasteful number, since it uses less digits than its factorization.

64890356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71074 (or 71072 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 64890356 is about 8055.4550461163. The cubic root of 64890356 is about 401.8463724914.

The spelling of 64890356 in words is "sixty-four million, eight hundred ninety thousand, three hundred fifty-six".