64979690 has 8 divisors (see below), whose sum is σ = 116963460. Its totient is φ = 25991872.

The previous prime is 64979671. The next prime is 64979723. The reversal of 64979690 is 9697946.

It can be written as a sum of positive squares in 2 ways, for example, as 64850809 + 128881 = 8053^2 + 359^2 .

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

It is a super-2 number, since 2×64979690² = 8444720224992200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3248975 + ... + 3248994.

Almost surely, 2^64979690 is an apocalyptic number.

64979690 is a deficient number, since it is larger than the sum of its proper divisors (51983770).

64979690 is a wasteful number, since it uses less digits than its factorization.

64979690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6497976.

The product of its (nonzero) digits is 734832, while the sum is 50.

The square root of 64979690 is about 8060.9980771614. The cubic root of 64979690 is about 402.0306940912.

The spelling of 64979690 in words is "sixty-four million, nine hundred seventy-nine thousand, six hundred ninety".