326400557 has 8 divisors (see below), whose sum is σ = 373636800. Its totient is φ = 279316224.

The previous prime is 326400533. The next prime is 326400577. The reversal of 326400557 is 755004623.

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

It is a cyclic number.

It is not a de Polignac number, because 326400557 - 2²⁸ = 57965101 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 (326400577) 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, 33332 + ... + 41997.

It is an arithmetic number, because the mean of its divisors is an integer number (46704600).

Almost surely, 2^326400557 is an apocalyptic number.

It is an amenable number.

326400557 is a deficient number, since it is larger than the sum of its proper divisors (47236243).

326400557 is an equidigital number, since it uses as much as digits as its factorization.

326400557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75955.

The product of its (nonzero) digits is 25200, while the sum is 32.

The square root of 326400557 is about 18066.5590802455. The cubic root of 326400557 is about 688.5206399424.

The spelling of 326400557 in words is "three hundred twenty-six million, four hundred thousand, five hundred fifty-seven".