64515381 has 8 divisors (see below), whose sum is σ = 98309184. Its totient is φ = 36865920.

The previous prime is 64515313. The next prime is 64515397. The reversal of 64515381 is 18351546.

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

It is not a de Polignac number, because 64515381 - 2¹³ = 64507189 is a prime.

It is a super-2 number, since 2×64515381² = 8324468771150322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64515301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1536060 + ... + 1536101.

It is an arithmetic number, because the mean of its divisors is an integer number (12288648).

Almost surely, 2^64515381 is an apocalyptic number.

It is an amenable number.

64515381 is a deficient number, since it is larger than the sum of its proper divisors (33793803).

64515381 is a wasteful number, since it uses less digits than its factorization.

64515381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3072171.

The product of its digits is 14400, while the sum is 33.

The square root of 64515381 is about 8032.1467242575. The cubic root of 64515381 is about 401.0708411068.

The spelling of 64515381 in words is "sixty-four million, five hundred fifteen thousand, three hundred eighty-one".