621604513 has 8 divisors (see below), whose sum is σ = 662205600. Its totient is φ = 581791968.

The previous prime is 621604441. The next prime is 621604537. The reversal of 621604513 is 315406126.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621604513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621604573) 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, 195508 + ... + 198661.

It is an arithmetic number, because the mean of its divisors is an integer number (82775700).

Almost surely, 2^621604513 is an apocalyptic number.

It is an amenable number.

621604513 is a deficient number, since it is larger than the sum of its proper divisors (40601087).

621604513 is a wasteful number, since it uses less digits than its factorization.

621604513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394271.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 621604513 is about 24931.9977739450. The cubic root of 621604513 is about 853.4368406581.

The spelling of 621604513 in words is "six hundred twenty-one million, six hundred four thousand, five hundred thirteen".