64986690 has 32 divisors (see below), whose sum is σ = 156260736. Its totient is φ = 17297280.

The previous prime is 64986673. The next prime is 64986697. The reversal of 64986690 is 9668946.

It is a super-2 number, since 2×64986690² = 8446539754312200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64986697) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17214 + ... + 20646.

It is an arithmetic number, because the mean of its divisors is an integer number (4883148).

Almost surely, 2^64986690 is an apocalyptic number.

64986690 is an abundant number, since it is smaller than the sum of its proper divisors (91274046).

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

64986690 is a wasteful number, since it uses less digits than its factorization.

64986690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4074.

The product of its (nonzero) digits is 559872, while the sum is 48.

The square root of 64986690 is about 8061.4322548788. The cubic root of 64986690 is about 402.0451299548.

The spelling of 64986690 in words is "sixty-four million, nine hundred eighty-six thousand, six hundred ninety".