77998399092 has 24 divisors (see below), whose sum is σ = 202218072000. Its totient is φ = 25999466328.

The previous prime is 77998399069. The next prime is 77998399097. The reversal of 77998399092 is 29099389977.

It is a self number, because there is not a number n which added to its sum of digits gives 77998399092.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77998399097) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 361103592 + ... + 361103807.

It is an arithmetic number, because the mean of its divisors is an integer number (8425753000).

Almost surely, 2^77998399092 is an apocalyptic number.

It is an amenable number.

77998399092 is an abundant number, since it is smaller than the sum of its proper divisors (124219672908).

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

77998399092 is a wasteful number, since it uses less digits than its factorization.

77998399092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722207412 (or 722207404 counting only the distinct ones).

The product of its (nonzero) digits is 138883248, while the sum is 72.

The spelling of 77998399092 in words is "seventy-seven billion, nine hundred ninety-eight million, three hundred ninety-nine thousand, ninety-two".