612531328 has 16 divisors (see below), whose sum is σ = 1220277510. Its totient is φ = 306265600.

The previous prime is 612531313. The next prime is 612531341. The reversal of 612531328 is 823135216.

It can be written as a sum of positive squares in only one way, i.e., 409981504 + 202549824 = 20248^2 + 14232^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 612531328.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2392573 + ... + 2392828.

Almost surely, 2^612531328 is an apocalyptic number.

It is an amenable number.

612531328 is a deficient number, since it is larger than the sum of its proper divisors (607746182).

612531328 is an equidigital number, since it uses as much as digits as its factorization.

612531328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4785415 (or 4785403 counting only the distinct ones).

The product of its digits is 8640, while the sum is 31.

The square root of 612531328 is about 24749.3702546146. The cubic root of 612531328 is about 849.2641049447.

The spelling of 612531328 in words is "six hundred twelve million, five hundred thirty-one thousand, three hundred twenty-eight".