64731630 has 16 divisors (see below), whose sum is σ = 155355984. Its totient is φ = 17261760.

The previous prime is 64731629. The next prime is 64731647. The reversal of 64731630 is 3613746.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 2157721 = 64731630 / (6 + 4 + 7 + 3 + 1 + 6 + 3 + 0).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1078831 + ... + 1078890.

It is an arithmetic number, because the mean of its divisors is an integer number (9709749).

Almost surely, 2^64731630 is an apocalyptic number.

64731630 is an abundant number, since it is smaller than the sum of its proper divisors (90624354).

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

64731630 is a wasteful number, since it uses less digits than its factorization.

64731630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2157731.

The product of its (nonzero) digits is 9072, while the sum is 30.

The square root of 64731630 is about 8045.5969324843. The cubic root of 64731630 is about 401.5184575890.

The spelling of 64731630 in words is "sixty-four million, seven hundred thirty-one thousand, six hundred thirty".