64507990 has 8 divisors (see below), whose sum is σ = 116114400. Its totient is φ = 25803192.

The previous prime is 64507987. The next prime is 64507991. The reversal of 64507990 is 9970546.

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

It is a super-2 number, since 2×64507990² = 8322561547680200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64507991) 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, 3225390 + ... + 3225409.

It is an arithmetic number, because the mean of its divisors is an integer number (14514300).

Almost surely, 2^64507990 is an apocalyptic number.

64507990 is a deficient number, since it is larger than the sum of its proper divisors (51606410).

64507990 is a wasteful number, since it uses less digits than its factorization.

64507990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6450806.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 64507990 is about 8031.6866223727. The cubic root of 64507990 is about 401.0555247189.

The spelling of 64507990 in words is "sixty-four million, five hundred seven thousand, nine hundred ninety".