64818091 has 16 divisors (see below), whose sum is σ = 71038240. Its totient is φ = 59136480.

The previous prime is 64818079. The next prime is 64818097. The reversal of 64818091 is 19081846.

It is a happy number.

It is not a de Polignac number, because 64818091 - 2⁹ = 64817579 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64818091.

It is not an unprimeable number, because it can be changed into a prime (64818097) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 358021 + ... + 358201.

It is an arithmetic number, because the mean of its divisors is an integer number (4439890).

Almost surely, 2^64818091 is an apocalyptic number.

64818091 is a deficient number, since it is larger than the sum of its proper divisors (6220149).

64818091 is a wasteful number, since it uses less digits than its factorization.

64818091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383 (or 357 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 64818091 is about 8050.9683268536. The cubic root of 64818091 is about 401.6971453105.

The spelling of 64818091 in words is "sixty-four million, eight hundred eighteen thousand, ninety-one".