80642780 has 24 divisors (see below), whose sum is σ = 174814080. Its totient is φ = 31216320.

The previous prime is 80642773. The next prime is 80642803. The reversal of 80642780 is 8724608.

It is a super-2 number, since 2×80642780² = 13006515932256800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 80642780.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64415 + ... + 65654.

It is an arithmetic number, because the mean of its divisors is an integer number (7283920).

Almost surely, 2^80642780 is an apocalyptic number.

It is an amenable number.

80642780 is an abundant number, since it is smaller than the sum of its proper divisors (94171300).

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

80642780 is a wasteful number, since it uses less digits than its factorization.

80642780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130109 (or 130107 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 80642780 is about 8980.1325157260. The cubic root of 80642780 is about 432.0378839091.

The spelling of 80642780 in words is "eighty million, six hundred forty-two thousand, seven hundred eighty".