215428825780 has 24 divisors (see below), whose sum is σ = 517029182208. Its totient is φ = 73861311648.

The previous prime is 215428825763. The next prime is 215428825813. The reversal of 215428825780 is 87528824512.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 769388524 + ... + 769388803.

It is an arithmetic number, because the mean of its divisors is an integer number (21542882592).

Almost surely, 2^215428825780 is an apocalyptic number.

215428825780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215428825780 is an abundant number, since it is smaller than the sum of its proper divisors (301600356428).

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

215428825780 is a wasteful number, since it uses less digits than its factorization.

215428825780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1538777343 (or 1538777341 counting only the distinct ones).

The product of its (nonzero) digits is 2867200, while the sum is 52.

The spelling of 215428825780 in words is "two hundred fifteen billion, four hundred twenty-eight million, eight hundred twenty-five thousand, seven hundred eighty".