64626820 has 24 divisors (see below), whose sum is σ = 135906624. Its totient is φ = 25814496.

The previous prime is 64626817. The next prime is 64626853. The reversal of 64626820 is 2862646.

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, 15919 + ... + 19561.

It is an arithmetic number, because the mean of its divisors is an integer number (5662776).

Almost surely, 2^64626820 is an apocalyptic number.

It is an amenable number.

64626820 is an abundant number, since it is smaller than the sum of its proper divisors (71279804).

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

64626820 is a wasteful number, since it uses less digits than its factorization.

64626820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4539 (or 4537 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 64626820 is about 8039.0807932251. The cubic root of 64626820 is about 401.3016347729.

The spelling of 64626820 in words is "sixty-four million, six hundred twenty-six thousand, eight hundred twenty".