99937890 has 96 divisors (see below), whose sum is σ = 281801520. Its totient is φ = 24427008.

The previous prime is 99937889. The next prime is 99937897. The reversal of 99937890 is 9873999.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 51538041 + 48399849 = 7179^2 + 6957^2 .

It is not an unprimeable number, because it can be changed into a prime (99937897) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 267744 + ... + 268116.

Almost surely, 2^99937890 is an apocalyptic number.

99937890 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 99937890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140900760).

99937890 is an abundant number, since it is smaller than the sum of its proper divisors (181863630).

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

99937890 is a wasteful number, since it uses less digits than its factorization.

99937890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628 (or 625 counting only the distinct ones).

The product of its (nonzero) digits is 1102248, while the sum is 54.

The square root of 99937890 is about 9996.8940176437. The cubic root of 99937890 is about 464.0627670984.

The spelling of 99937890 in words is "ninety-nine million, nine hundred thirty-seven thousand, eight hundred ninety".