99778572 has 72 divisors (see below), whose sum is σ = 258935040. Its totient is φ = 32387040.

The previous prime is 99778571. The next prime is 99778573. The reversal of 99778572 is 27587799.

It is an interprime number because it is at equal distance from previous prime (99778571) and next prime (99778573).

It is not an unprimeable number, because it can be changed into a prime (99778571) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 263079 + ... + 263457.

It is an arithmetic number, because the mean of its divisors is an integer number (3596320).

Almost surely, 2^99778572 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99778572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129467520).

99778572 is an abundant number, since it is smaller than the sum of its proper divisors (159156468).

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

99778572 is a wasteful number, since it uses less digits than its factorization.

99778572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563 (or 558 counting only the distinct ones).

The product of its digits is 2222640, while the sum is 54.

The square root of 99778572 is about 9988.9224644103. The cubic root of 99778572 is about 463.8160376070.

The spelling of 99778572 in words is "ninety-nine million, seven hundred seventy-eight thousand, five hundred seventy-two".