3155728820 has 12 divisors (see below), whose sum is σ = 6627030564. Its totient is φ = 1262291520.

The previous prime is 3155728817. The next prime is 3155728831. The reversal of 3155728820 is 288275513.

It can be written as a sum of positive squares in 2 ways, for example, as 743543824 + 2412184996 = 27268^2 + 49114^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78893201 + ... + 78893240.

It is an arithmetic number, because the mean of its divisors is an integer number (552252547).

Almost surely, 2^3155728820 is an apocalyptic number.

It is an amenable number.

3155728820 is an abundant number, since it is smaller than the sum of its proper divisors (3471301744).

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

3155728820 is a wasteful number, since it uses less digits than its factorization.

3155728820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157786450 (or 157786448 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 41.

The square root of 3155728820 is about 56175.8740029917. The cubic root of 3155728820 is about 1466.7853332590.

The spelling of 3155728820 in words is "three billion, one hundred fifty-five million, seven hundred twenty-eight thousand, eight hundred twenty".