616321604 has 12 divisors (see below), whose sum is σ = 1142007804. Its totient is φ = 290033664.

The previous prime is 616321603. The next prime is 616321609. The reversal of 616321604 is 406123616.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 320481604 + 295840000 = 17902^2 + 17200^2 .

It is a super-3 number, since 3×616321604³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (616321603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4531709 + ... + 4531844.

It is an arithmetic number, because the mean of its divisors is an integer number (95167317).

Almost surely, 2^616321604 is an apocalyptic number.

It is an amenable number.

616321604 is a deficient number, since it is larger than the sum of its proper divisors (525686200).

616321604 is a wasteful number, since it uses less digits than its factorization.

616321604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9063574 (or 9063572 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 616321604 is about 24825.8253437826. The cubic root of 616321604 is about 851.0122215695.

It can be divided in two parts, 61632 and 1604, that added together give a palindrome (63236).

The spelling of 616321604 in words is "six hundred sixteen million, three hundred twenty-one thousand, six hundred four".