82407978 has 24 divisors (see below), whose sum is σ = 187948800. Its totient is φ = 26023464.

The previous prime is 82407977. The next prime is 82408003. The reversal of 82407978 is 87970428.

It is not an unprimeable number, because it can be changed into a prime (82407971) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 120138 + ... + 120821.

It is an arithmetic number, because the mean of its divisors is an integer number (7831200).

Almost surely, 2^82407978 is an apocalyptic number.

82407978 is an abundant number, since it is smaller than the sum of its proper divisors (105540822).

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

82407978 is a wasteful number, since it uses less digits than its factorization.

82407978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240986 (or 240983 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 82407978 is about 9077.8840045464. The cubic root of 82407978 is about 435.1674662380.

The spelling of 82407978 in words is "eighty-two million, four hundred seven thousand, nine hundred seventy-eight".