64431057 has 8 divisors (see below), whose sum is σ = 86995840. Its totient is φ = 42410160.

The previous prime is 64431053. The next prime is 64431061. The reversal of 64431057 is 75013446.

It is an interprime number because it is at equal distance from previous prime (64431053) and next prime (64431061).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64431057 - 2² = 64431053 is a prime.

It is a super-2 number, since 2×64431057² = 8302722212274498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64431053) 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, 135694 + ... + 136167.

It is an arithmetic number, because the mean of its divisors is an integer number (10874480).

Almost surely, 2^64431057 is an apocalyptic number.

It is an amenable number.

64431057 is a deficient number, since it is larger than the sum of its proper divisors (22564783).

64431057 is a wasteful number, since it uses less digits than its factorization.

64431057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271943.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 64431057 is about 8026.8958508255. The cubic root of 64431057 is about 400.8960267581.

The spelling of 64431057 in words is "sixty-four million, four hundred thirty-one thousand, fifty-seven".