99975780 has 36 divisors (see below), whose sum is σ = 303260412. Its totient is φ = 26660160.

The previous prime is 99975773. The next prime is 99975787. The reversal of 99975780 is 8757999.

It is an interprime number because it is at equal distance from previous prime (99975773) and next prime (99975787).

It can be written as a sum of positive squares in 2 ways, for example, as 14930496 + 85045284 = 3864^2 + 9222^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (99975787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 277531 + ... + 277890.

Almost surely, 2^99975780 is an apocalyptic number.

99975780 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

99975780 is an abundant number, since it is smaller than the sum of its proper divisors (203284632).

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

99975780 is a wasteful number, since it uses less digits than its factorization.

99975780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555436 (or 555431 counting only the distinct ones).

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

The square root of 99975780 is about 9998.7889266651. The cubic root of 99975780 is about 464.1214072417.

The spelling of 99975780 in words is "ninety-nine million, nine hundred seventy-five thousand, seven hundred eighty".