78117982 has 8 divisors (see below), whose sum is σ = 122271696. Its totient is φ = 37360752.

The previous prime is 78117979. The next prime is 78117983. The reversal of 78117982 is 28971187.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×78117982² = 12204838223504648, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78117983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 849063 + ... + 849154.

It is an arithmetic number, because the mean of its divisors is an integer number (15283962).

Almost surely, 2^78117982 is an apocalyptic number.

78117982 is a deficient number, since it is larger than the sum of its proper divisors (44153714).

78117982 is a wasteful number, since it uses less digits than its factorization.

78117982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1698242.

The product of its digits is 56448, while the sum is 43.

The square root of 78117982 is about 8838.4377578846. The cubic root of 78117982 is about 427.4811856339.

The spelling of 78117982 in words is "seventy-eight million, one hundred seventeen thousand, nine hundred eighty-two".