64893905 has 8 divisors (see below), whose sum is σ = 78748200. Its totient is φ = 51331456.

The previous prime is 64893901. The next prime is 64893919. The reversal of 64893905 is 50939846.

It can be written as a sum of positive squares in 4 ways, for example, as 364816 + 64529089 = 604^2 + 8033^2 .

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 64893905 - 2² = 64893901 is a prime.

It is a super-2 number, since 2×64893905² = 8422437812298050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64893901) 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, 72470 + ... + 73359.

It is an arithmetic number, because the mean of its divisors is an integer number (9843525).

Almost surely, 2^64893905 is an apocalyptic number.

It is an amenable number.

64893905 is a deficient number, since it is larger than the sum of its proper divisors (13854295).

64893905 is a wasteful number, since it uses less digits than its factorization.

64893905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145923.

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 64893905 is about 8055.6753286115. The cubic root of 64893905 is about 401.8536983195.

The spelling of 64893905 in words is "sixty-four million, eight hundred ninety-three thousand, nine hundred five".