64814820 has 48 divisors (see below), whose sum is σ = 207408768. Its totient is φ = 14814720.

The previous prime is 64814819. The next prime is 64814899. The reversal of 64814820 is 2841846.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76741 + ... + 77580.

It is an arithmetic number, because the mean of its divisors is an integer number (4321016).

Almost surely, 2^64814820 is an apocalyptic number.

64814820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64814820 is an abundant number, since it is smaller than the sum of its proper divisors (142593948).

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

64814820 is a wasteful number, since it uses less digits than its factorization.

64814820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154340 (or 154338 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 64814820 is about 8050.7651810247. The cubic root of 64814820 is about 401.6903880743.

The spelling of 64814820 in words is "sixty-four million, eight hundred fourteen thousand, eight hundred twenty".