64257986 has 8 divisors (see below), whose sum is σ = 103801404. Its totient is φ = 29657520.

The previous prime is 64257983. The next prime is 64258003. The reversal of 64257986 is 68975246.

It can be written as a sum of positive squares in 2 ways, for example, as 62900761 + 1357225 = 7931^2 + 1165^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 64257986.

It is not an unprimeable number, because it can be changed into a prime (64257983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1235705 + ... + 1235756.

Almost surely, 2^64257986 is an apocalyptic number.

64257986 is a deficient number, since it is larger than the sum of its proper divisors (39543418).

64257986 is a wasteful number, since it uses less digits than its factorization.

64257986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2471476.

The product of its digits is 725760, while the sum is 47.

The square root of 64257986 is about 8016.1079084553. The cubic root of 64257986 is about 400.5367502591.

The spelling of 64257986 in words is "sixty-four million, two hundred fifty-seven thousand, nine hundred eighty-six".