64138090 has 8 divisors (see below), whose sum is σ = 115448580. Its totient is φ = 25655232.

The previous prime is 64138079. The next prime is 64138103. The reversal of 64138090 is 9083146.

It can be written as a sum of positive squares in 2 ways, for example, as 59459521 + 4678569 = 7711^2 + 2163^2 .

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

It is a super-2 number, since 2×64138090² = 8227389177696200, 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, 3206895 + ... + 3206914.

Almost surely, 2^64138090 is an apocalyptic number.

64138090 is a deficient number, since it is larger than the sum of its proper divisors (51310490).

64138090 is a wasteful number, since it uses less digits than its factorization.

64138090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6413816.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 64138090 is about 8008.6259745352. The cubic root of 64138090 is about 400.2874808374.

The spelling of 64138090 in words is "sixty-four million, one hundred thirty-eight thousand, ninety".