64691055 has 80 divisors (see below), whose sum is σ = 136360224. Its totient is φ = 28926720.

The previous prime is 64691047. The next prime is 64691093. The reversal of 64691055 is 55019646.

64691055 is a `hidden beast` number, since 646 + 9 + 1 + 0 + 5 + 5 = 666.

It is not a de Polignac number, because 64691055 - 2³ = 64691047 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 57357 + ... + 58473.

Almost surely, 2^64691055 is an apocalyptic number.

64691055 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

64691055 is an abundant number, since it is smaller than the sum of its proper divisors (71669169).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64691055 is a wasteful number, since it uses less digits than its factorization.

64691055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1158 (or 1149 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 64691055 is about 8043.0749716759. The cubic root of 64691055 is about 401.4345469539.

The spelling of 64691055 in words is "sixty-four million, six hundred ninety-one thousand, fifty-five".