321604425 has 72 divisors (see below), whose sum is σ = 602836416. Its totient is φ = 169957440.

The previous prime is 321604421. The next prime is 321604427. The reversal of 321604425 is 524406123.

321604425 is a `hidden beast` number, since 3 + 216 + 0 + 442 + 5 = 666.

It is not a de Polignac number, because 321604425 - 2² = 321604421 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (321604421) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1014367 + ... + 1014683.

It is an arithmetic number, because the mean of its divisors is an integer number (8372728).

Almost surely, 2^321604425 is an apocalyptic number.

It is an amenable number.

321604425 is a deficient number, since it is larger than the sum of its proper divisors (281231991).

321604425 is a wasteful number, since it uses less digits than its factorization.

321604425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509 (or 492 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 321604425 is about 17933.3327912020. The cubic root of 321604425 is about 685.1316102101.

It can be divided in two parts, 32160 and 4425, that added together give a triangular number (36585 = T₂₇₀).

The spelling of 321604425 in words is "three hundred twenty-one million, six hundred four thousand, four hundred twenty-five".