612721330 has 48 divisors (see below), whose sum is σ = 1201961880. Its totient is φ = 224880864.

The previous prime is 612721321. The next prime is 612721363. The reversal of 612721330 is 33127216.

It can be written as a sum of positive squares in 4 ways, for example, as 10067929 + 602653401 = 3173^2 + 24549^2 .

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 612721295 and 612721304.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3668907 + ... + 3669073.

Almost surely, 2^612721330 is an apocalyptic number.

612721330 is a deficient number, since it is larger than the sum of its proper divisors (589240550).

612721330 is an equidigital number, since it uses as much as digits as its factorization.

612721330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380 (or 187 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 612721330 is about 24753.2084789023. The cubic root of 612721330 is about 849.3519073637.

Adding to 612721330 its reverse (33127216), we get a palindrome (645848546).

The spelling of 612721330 in words is "six hundred twelve million, seven hundred twenty-one thousand, three hundred thirty".