99857970 has 24 divisors (see below), whose sum is σ = 259630956. Its totient is φ = 26628768.

The previous prime is 99857957. The next prime is 99858023. The reversal of 99857970 is 7975899.

It can be written as a sum of positive squares in 2 ways, for example, as 90839961 + 9018009 = 9531^2 + 3003^2 .

It is a super-2 number, since 2×99857970² = 19943228345041800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 554677 + ... + 554856.

Almost surely, 2^99857970 is an apocalyptic number.

99857970 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

99857970 is an abundant number, since it is smaller than the sum of its proper divisors (159772986).

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

99857970 is a wasteful number, since it uses less digits than its factorization.

99857970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109546 (or 1109543 counting only the distinct ones).

The product of its (nonzero) digits is 1428840, while the sum is 54.

The square root of 99857970 is about 9992.8959766426. The cubic root of 99857970 is about 463.9390309556.

It can be divided in two parts, 9985 and 7970, that added together give a triangular number (17955 = T₁₈₉).

The spelling of 99857970 in words is "ninety-nine million, eight hundred fifty-seven thousand, nine hundred seventy".