64981830 has 32 divisors (see below), whose sum is σ = 156471264. Its totient is φ = 17271296.

The previous prime is 64981817. The next prime is 64981867. The reversal of 64981830 is 3818946.

It is a Curzon number.

It is a congruent number.

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, 6094 + ... + 12926.

It is an arithmetic number, because the mean of its divisors is an integer number (4889727).

Almost surely, 2^64981830 is an apocalyptic number.

64981830 is an abundant number, since it is smaller than the sum of its proper divisors (91489434).

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

64981830 is a wasteful number, since it uses less digits than its factorization.

64981830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7160.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 64981830 is about 8061.1308139739. The cubic root of 64981830 is about 402.0351074510.

The spelling of 64981830 in words is "sixty-four million, nine hundred eighty-one thousand, eight hundred thirty".