99772420 has 48 divisors (see below), whose sum is σ = 240609600. Its totient is φ = 34369920.

The previous prime is 99772417. The next prime is 99772487. The reversal of 99772420 is 2427799.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7755 + ... + 16114.

It is an arithmetic number, because the mean of its divisors is an integer number (5012700).

Almost surely, 2^99772420 is an apocalyptic number.

It is an amenable number.

99772420 is an abundant number, since it is smaller than the sum of its proper divisors (140837180).

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

99772420 is a wasteful number, since it uses less digits than its factorization.

99772420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23908 (or 23906 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 99772420 is about 9988.6145185406. The cubic root of 99772420 is about 463.8065049828.

The spelling of 99772420 in words is "ninety-nine million, seven hundred seventy-two thousand, four hundred twenty".