64811216 has 10 divisors (see below), whose sum is σ = 125571762. Its totient is φ = 32405600.

The previous prime is 64811207. The next prime is 64811221. The reversal of 64811216 is 61211846.

It can be written as a sum of positive squares in only one way, i.e., 63361600 + 1449616 = 7960^2 + 1204^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2025335 + ... + 2025366.

Almost surely, 2^64811216 is an apocalyptic number.

It is an amenable number.

64811216 is a deficient number, since it is larger than the sum of its proper divisors (60760546).

64811216 is a wasteful number, since it uses less digits than its factorization.

64811216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4050709 (or 4050703 counting only the distinct ones).

The product of its digits is 2304, while the sum is 29.

The square root of 64811216 is about 8050.5413482573. The cubic root of 64811216 is about 401.6829426629.

The spelling of 64811216 in words is "sixty-four million, eight hundred eleven thousand, two hundred sixteen".