64331855 has 24 divisors (see below), whose sum is σ = 90761328. Its totient is φ = 43642368.

The previous prime is 64331819. The next prime is 64331867. The reversal of 64331855 is 55813346.

It is not a de Polignac number, because 64331855 - 2¹⁰ = 64330831 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22412 + ... + 25118.

It is an arithmetic number, because the mean of its divisors is an integer number (3781722).

Almost surely, 2^64331855 is an apocalyptic number.

64331855 is a deficient number, since it is larger than the sum of its proper divisors (26429473).

64331855 is a wasteful number, since it uses less digits than its factorization.

64331855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2823 (or 2816 counting only the distinct ones).

The product of its digits is 43200, while the sum is 35.

The square root of 64331855 is about 8020.7141203262. The cubic root of 64331855 is about 400.6901730513.

The spelling of 64331855 in words is "sixty-four million, three hundred thirty-one thousand, eight hundred fifty-five".