64151990 has 16 divisors (see below), whose sum is σ = 131969952. Its totient is φ = 21994944.

The previous prime is 64151977. The next prime is 64151993. The reversal of 64151990 is 9915146.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 64151990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64151993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 458159 + ... + 458298.

It is an arithmetic number, because the mean of its divisors is an integer number (8248122).

Almost surely, 2^64151990 is an apocalyptic number.

64151990 is an abundant number, since it is smaller than the sum of its proper divisors (67817962).

64151990 is a wasteful number, since it uses less digits than its factorization.

64151990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916471.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 64151990 is about 8009.4937418042. The cubic root of 64151990 is about 400.3163955021.

The spelling of 64151990 in words is "sixty-four million, one hundred fifty-one thousand, nine hundred ninety".