64874991 has 8 divisors (see below), whose sum is σ = 87018624. Its totient is φ = 42990680.

The previous prime is 64874977. The next prime is 64875017. The reversal of 64874991 is 19947846.

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 64874991 - 2¹⁰ = 64873967 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64874991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64874921) 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, 64245 + ... + 65246.

It is an arithmetic number, because the mean of its divisors is an integer number (10877328).

Almost surely, 2^64874991 is an apocalyptic number.

64874991 is a deficient number, since it is larger than the sum of its proper divisors (22143633).

64874991 is a wasteful number, since it uses less digits than its factorization.

64874991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129661.

The product of its digits is 435456, while the sum is 48.

The square root of 64874991 is about 8054.5012880997. The cubic root of 64874991 is about 401.8146530533.

The spelling of 64874991 in words is "sixty-four million, eight hundred seventy-four thousand, nine hundred ninety-one".