64790820 has 48 divisors (see below), whose sum is σ = 201573120. Its totient is φ = 17277408.

The previous prime is 64790813. The next prime is 64790833. The reversal of 64790820 is 2809746.

64790820 is a `hidden beast` number, since 647 + 9 + 0 + 8 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 59452 + ... + 60531.

It is an arithmetic number, because the mean of its divisors is an integer number (4199440).

Almost surely, 2^64790820 is an apocalyptic number.

64790820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64790820 is an abundant number, since it is smaller than the sum of its proper divisors (136782300).

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

64790820 is a wasteful number, since it uses less digits than its factorization.

64790820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120001 (or 119993 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 64790820 is about 8049.2745014691. The cubic root of 64790820 is about 401.6408018866.

The spelling of 64790820 in words is "sixty-four million, seven hundred ninety thousand, eight hundred twenty".