64472091 has 4 divisors (see below), whose sum is σ = 85962792. Its totient is φ = 42981392.

The previous prime is 64472087. The next prime is 64472099. The reversal of 64472091 is 19027446.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64472091 - 2² = 64472087 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64472099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10745346 + ... + 10745351.

It is an arithmetic number, because the mean of its divisors is an integer number (21490698).

Almost surely, 2^64472091 is an apocalyptic number.

64472091 is a deficient number, since it is larger than the sum of its proper divisors (21490701).

64472091 is a wasteful number, since it uses less digits than its factorization.

64472091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21490700.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 64472091 is about 8029.4514756613. The cubic root of 64472091 is about 400.9811144851.

The spelling of 64472091 in words is "sixty-four million, four hundred seventy-two thousand, ninety-one".