99557478 has 64 divisors (see below), whose sum is σ = 234316800. Its totient is φ = 31268160.

The previous prime is 99557477. The next prime is 99557503. The reversal of 99557478 is 87475599.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99557477) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87618 + ... + 88746.

It is an arithmetic number, because the mean of its divisors is an integer number (3661200).

Almost surely, 2^99557478 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99557478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117158400).

99557478 is an abundant number, since it is smaller than the sum of its proper divisors (134759322).

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

99557478 is a wasteful number, since it uses less digits than its factorization.

99557478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1234 (or 1228 counting only the distinct ones).

The product of its digits is 3175200, while the sum is 54.

The square root of 99557478 is about 9977.8493674739. The cubic root of 99557478 is about 463.4732025437.

The spelling of 99557478 in words is "ninety-nine million, five hundred fifty-seven thousand, four hundred seventy-eight".