64430279 has 4 divisors (see below), whose sum is σ = 65801184. Its totient is φ = 63059376.

The previous prime is 64430263. The next prime is 64430287. The reversal of 64430279 is 97203446.

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 64430279 - 2⁴ = 64430263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64430239) 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, 685382 + ... + 685475.

It is an arithmetic number, because the mean of its divisors is an integer number (16450296).

Almost surely, 2^64430279 is an apocalyptic number.

64430279 is a deficient number, since it is larger than the sum of its proper divisors (1370905).

64430279 is a wasteful number, since it uses less digits than its factorization.

64430279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1370904.

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 64430279 is about 8026.8473886078. The cubic root of 64430279 is about 400.8944131555.

The spelling of 64430279 in words is "sixty-four million, four hundred thirty thousand, two hundred seventy-nine".