30620639 has 8 divisors (see below), whose sum is σ = 35709600. Its totient is φ = 26245968.

The previous prime is 30620633. The next prime is 30620651. The reversal of 30620639 is 93602603.

It is not a de Polignac number, because 30620639 - 2²⁰ = 29572063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30620633) 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, 44294 + ... + 44979.

It is an arithmetic number, because the mean of its divisors is an integer number (4463700).

Almost surely, 2^30620639 is an apocalyptic number.

30620639 is a deficient number, since it is larger than the sum of its proper divisors (5088961).

30620639 is an frugal number, since it uses more digits than its factorization.

30620639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89294 (or 89280 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 29.

The square root of 30620639 is about 5533.5918714701. The cubic root of 30620639 is about 312.8513858614.

The spelling of 30620639 in words is "thirty million, six hundred twenty thousand, six hundred thirty-nine".