999975550 has 24 divisors (see below), whose sum is σ = 2125663056. Its totient is φ = 342848640.

The previous prime is 999975523. The next prime is 999975551. The reversal of 999975550 is 55579999.

It is a super-2 number, since 2×999975550² = 1999902201195605000, which contains 22 as substring.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999975551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1428187 + ... + 1428886.

It is an arithmetic number, because the mean of its divisors is an integer number (88569294).

Almost surely, 2^999975550 is an apocalyptic number.

999975550 is an abundant number, since it is smaller than the sum of its proper divisors (1125687506).

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

999975550 is a wasteful number, since it uses less digits than its factorization.

999975550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2857092 (or 2857087 counting only the distinct ones).

The product of its (nonzero) digits is 5740875, while the sum is 58.

The square root of 999975550 is about 31622.3900108768. The cubic root of 999975550 is about 999.9918499336.

The spelling of 999975550 in words is "nine hundred ninety-nine million, nine hundred seventy-five thousand, five hundred fifty".