99761640 has 64 divisors (see below), whose sum is σ = 326496960. Its totient is φ = 24184320.

The previous prime is 99761621. The next prime is 99761659. The reversal of 99761640 is 4616799.

It is an interprime number because it is at equal distance from previous prime (99761621) and next prime (99761659).

It is a junction number, because it is equal to n+sod(n) for n = 99761592 and 99761601.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36469 + ... + 39108.

It is an arithmetic number, because the mean of its divisors is an integer number (5101515).

Almost surely, 2^99761640 is an apocalyptic number.

It is an amenable number.

99761640 is an abundant number, since it is smaller than the sum of its proper divisors (226735320).

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

99761640 is a wasteful number, since it uses less digits than its factorization.

99761640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75602 (or 75598 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 99761640 is about 9988.0748895871. The cubic root of 99761640 is about 463.7898002521.

The spelling of 99761640 in words is "ninety-nine million, seven hundred sixty-one thousand, six hundred forty".