30945521620 has 48 divisors (see below), whose sum is σ = 71691450768. Its totient is φ = 11147351040.

The previous prime is 30945521609. The next prime is 30945521627. The reversal of 30945521620 is 2612554903.

It can be written as a sum of positive squares in 8 ways, for example, as 6073708356 + 24871813264 = 77934^2 + 157708^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 30945521620.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30945521627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1440819 + ... + 1462138.

It is an arithmetic number, because the mean of its divisors is an integer number (1493571891).

Almost surely, 2^30945521620 is an apocalyptic number.

It is an amenable number.

30945521620 is an abundant number, since it is smaller than the sum of its proper divisors (40745929148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30945521620 is a wasteful number, since it uses less digits than its factorization.

30945521620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2903020 (or 2903018 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 30945521620 in words is "thirty billion, nine hundred forty-five million, five hundred twenty-one thousand, six hundred twenty".