99428091840 has 896 divisors, whose sum is σ = 441861488640. Its totient is φ = 20445696000.

The previous prime is 99428091809. The next prime is 99428091871. The reversal of 99428091840 is 4819082499.

99428091840 is a `hidden beast` number, since 99 + 428 + 0 + 91 + 8 + 40 = 666.

It is an interprime number because it is at equal distance from previous prime (99428091809) and next prime (99428091871).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 68523115 + ... + 68524565.

Almost surely, 2^99428091840 is an apocalyptic number.

99428091840 is a gapful number since it is divisible by the number (90) 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 99428091840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (220930744320).

99428091840 is an abundant number, since it is smaller than the sum of its proper divisors (342433396800).

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

99428091840 is a wasteful number, since it uses less digits than its factorization.

99428091840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1598 (or 1582 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 54.

The spelling of 99428091840 in words is "ninety-nine billion, four hundred twenty-eight million, ninety-one thousand, eight hundred forty".