99787829475 has 48 divisors (see below), whose sum is σ = 174625767680. Its totient is φ = 50140425600.

The previous prime is 99787829447. The next prime is 99787829497. The reversal of 99787829475 is 57492878799.

It is a happy number.

It is not a de Polignac number, because 99787829475 - 2¹¹ = 99787827427 is a prime.

It is a super-2 number, since 2×99787829475² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (75).

It is a junction number, because it is equal to n+sod(n) for n = 99787829397 and 99787829406.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 64482 + ... + 451368.

Almost surely, 2^99787829475 is an apocalyptic number.

99787829475 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

99787829475 is the 257925-th pentagonal number.

99787829475 is a deficient number, since it is larger than the sum of its proper divisors (74837938205).

99787829475 is a wasteful number, since it uses less digits than its factorization.

99787829475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387100 (or 387095 counting only the distinct ones).

The product of its digits is 640120320, while the sum is 75.

The spelling of 99787829475 in words is "ninety-nine billion, seven hundred eighty-seven million, eight hundred twenty-nine thousand, four hundred seventy-five".