99078561 has 24 divisors (see below), whose sum is σ = 145708160. Its totient is φ = 64864800.

The previous prime is 99078557. The next prime is 99078631. The reversal of 99078561 is 16587099.

It is not a de Polignac number, because 99078561 - 2² = 99078557 is a prime.

It is a super-2 number, since 2×99078561² = 19633122499661442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99078541) 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, 235131 + ... + 235551.

Almost surely, 2^99078561 is an apocalyptic number.

It is an amenable number.

99078561 is a deficient number, since it is larger than the sum of its proper divisors (46629599).

99078561 is a wasteful number, since it uses less digits than its factorization.

99078561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837 (or 834 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 99078561 is about 9953.8214269696. The cubic root of 99078561 is about 462.7288349934.

The spelling of 99078561 in words is "ninety-nine million, seventy-eight thousand, five hundred sixty-one".