82644780 has 48 divisors (see below), whose sum is σ = 239389920. Its totient is φ = 21278208.

The previous prime is 82644763. The next prime is 82644799. The reversal of 82644780 is 8744628.

It is a super-2 number, since 2×82644780² = 13660319322496800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22009 + ... + 25488.

It is an arithmetic number, because the mean of its divisors is an integer number (4987290).

Almost surely, 2^82644780 is an apocalyptic number.

It is an amenable number.

82644780 is an abundant number, since it is smaller than the sum of its proper divisors (156745140).

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

82644780 is a wasteful number, since it uses less digits than its factorization.

82644780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47538 (or 47536 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 39.

The square root of 82644780 is about 9090.9174454507. The cubic root of 82644780 is about 435.5838902367.

The spelling of 82644780 in words is "eighty-two million, six hundred forty-four thousand, seven hundred eighty".