99387478877856 has 192 divisors, whose sum is σ = 290987508067200. Its totient is φ = 29491871625216.

The previous prime is 99387478877809. The next prime is 99387478877933. The reversal of 99387478877856 is 65877887478399.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (96).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29490490 + ... + 32687366.

It is an arithmetic number, because the mean of its divisors is an integer number (1515559937850).

Almost surely, 2^{99387478877856} is an apocalyptic number.

99387478877856 is a gapful number since it is divisible by the number (96) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99387478877856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145493754033600).

99387478877856 is an abundant number, since it is smaller than the sum of its proper divisors (191600029189344).

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

99387478877856 is a wasteful number, since it uses less digits than its factorization.

99387478877856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3197791 (or 3197783 counting only the distinct ones).

The product of its digits is 286773903360, while the sum is 96.

The spelling of 99387478877856 in words is "ninety-nine trillion, three hundred eighty-seven billion, four hundred seventy-eight million, eight hundred seventy-seven thousand, eight hundred fifty-six".