77999946 has 32 divisors (see below), whose sum is σ = 163313280. Its totient is φ = 24788544.

The previous prime is 77999869. The next prime is 77999951. The reversal of 77999946 is 64999977.

It is a self number, because there is not a number n which added to its sum of digits gives 77999946.

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 15 ways as a sum of consecutive naturals, for example, 52956 + ... + 54408.

It is an arithmetic number, because the mean of its divisors is an integer number (5103540).

Almost surely, 2^77999946 is an apocalyptic number.

77999946 is an abundant number, since it is smaller than the sum of its proper divisors (85313334).

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

77999946 is a wasteful number, since it uses less digits than its factorization.

77999946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1870.

The product of its digits is 7715736, while the sum is 60.

The square root of 77999946 is about 8831.7578091793. The cubic root of 77999946 is about 427.2657695700.

The spelling of 77999946 in words is "seventy-seven million, nine hundred ninety-nine thousand, nine hundred forty-six".