99777560 has 16 divisors (see below), whose sum is σ = 224499600. Its totient is φ = 39911008.

The previous prime is 99777551. The next prime is 99777571. The reversal of 99777560 is 6577799.

It is a super-2 number, since 2×99777560² = 19911122959107200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 99777499 and 99777508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1247180 + ... + 1247259.

It is an arithmetic number, because the mean of its divisors is an integer number (14031225).

Almost surely, 2^99777560 is an apocalyptic number.

It is an amenable number.

99777560 is an abundant number, since it is smaller than the sum of its proper divisors (124722040).

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

99777560 is a wasteful number, since it uses less digits than its factorization.

99777560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2494450 (or 2494446 counting only the distinct ones).

The product of its (nonzero) digits is 833490, while the sum is 50.

The square root of 99777560 is about 9988.8718081673. The cubic root of 99777560 is about 463.8144695235.

The spelling of 99777560 in words is "ninety-nine million, seven hundred seventy-seven thousand, five hundred sixty".