64999081 has 8 divisors (see below), whose sum is σ = 77514624. Its totient is φ = 53291040.

The previous prime is 64999037. The next prime is 64999087. The reversal of 64999081 is 18099946.

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

It is a cyclic number.

It is not a de Polignac number, because 64999081 - 2¹⁵ = 64966313 is a prime.

It is a super-2 number, since 2×64999081² = 8449761061689122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64999087) 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, 201700 + ... + 202021.

It is an arithmetic number, because the mean of its divisors is an integer number (9689328).

Almost surely, 2^64999081 is an apocalyptic number.

It is an amenable number.

64999081 is a deficient number, since it is larger than the sum of its proper divisors (12515543).

64999081 is a wasteful number, since it uses less digits than its factorization.

64999081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403751.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 64999081 is about 8062.2007541366. The cubic root of 64999081 is about 402.0706809541.

The spelling of 64999081 in words is "sixty-four million, nine hundred ninety-nine thousand, eighty-one".