99550578 has 16 divisors (see below), whose sum is σ = 207758016. Its totient is φ = 31740720.

The previous prime is 99550573. The next prime is 99550603. The reversal of 99550578 is 87505599.

It is not an unprimeable number, because it can be changed into a prime (99550573) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 360553 + ... + 360828.

It is an arithmetic number, because the mean of its divisors is an integer number (12984876).

Almost surely, 2^99550578 is an apocalyptic number.

99550578 is an abundant number, since it is smaller than the sum of its proper divisors (108207438).

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

99550578 is a wasteful number, since it uses less digits than its factorization.

99550578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721409.

The product of its (nonzero) digits is 567000, while the sum is 48.

The square root of 99550578 is about 9977.5035955894. The cubic root of 99550578 is about 463.4624950306.

It can be divided in two parts, 99550 and 578, that added together give a triangular number (100128 = T₄₄₇).

The spelling of 99550578 in words is "ninety-nine million, five hundred fifty thousand, five hundred seventy-eight".