64430091 has 48 divisors (see below), whose sum is σ = 105850368. Its totient is φ = 37425600.

The previous prime is 64430087. The next prime is 64430099. The reversal of 64430091 is 19003446.

It is not a de Polignac number, because 64430091 - 2² = 64430087 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64430099) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 283720 + ... + 283946.

It is an arithmetic number, because the mean of its divisors is an integer number (2205216).

Almost surely, 2^64430091 is an apocalyptic number.

64430091 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

64430091 is a deficient number, since it is larger than the sum of its proper divisors (41420277).

64430091 is a wasteful number, since it uses less digits than its factorization.

64430091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352 (or 349 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 64430091 is about 8026.8356778995. The cubic root of 64430091 is about 400.8940232341.

The spelling of 64430091 in words is "sixty-four million, four hundred thirty thousand, ninety-one".