64981790 has 16 divisors (see below), whose sum is σ = 117134640. Its totient is φ = 25955520.

The previous prime is 64981789. The next prime is 64981799. The reversal of 64981790 is 9718946.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64981799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3341 + ... + 11879.

It is an arithmetic number, because the mean of its divisors is an integer number (7320915).

Almost surely, 2^64981790 is an apocalyptic number.

64981790 is a deficient number, since it is larger than the sum of its proper divisors (52152850).

64981790 is a wasteful number, since it uses less digits than its factorization.

64981790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9307.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 64981790 is about 8061.1283329321. The cubic root of 64981790 is about 402.0350249592.

The spelling of 64981790 in words is "sixty-four million, nine hundred eighty-one thousand, seven hundred ninety".