64191970 has 16 divisors (see below), whose sum is σ = 115867008. Its totient is φ = 25605360.

The previous prime is 64191943. The next prime is 64191971. The reversal of 64191970 is 7919146.

It is not an unprimeable number, because it can be changed into a prime (64191971) 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, 5076 + ... + 12415.

It is an arithmetic number, because the mean of its divisors is an integer number (7241688).

Almost surely, 2^64191970 is an apocalyptic number.

64191970 is a deficient number, since it is larger than the sum of its proper divisors (51675038).

64191970 is a wasteful number, since it uses less digits than its factorization.

64191970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17865.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 64191970 is about 8011.9891412807. The cubic root of 64191970 is about 400.3995382900.

The spelling of 64191970 in words is "sixty-four million, one hundred ninety-one thousand, nine hundred seventy".