99955640 has 32 divisors (see below), whose sum is σ = 225754560. Its totient is φ = 39830400.

The previous prime is 99955613. The next prime is 99955643. The reversal of 99955640 is 4655999.

It is a super-2 number, since 2×99955640² = 19982259935619200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99955643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6230 + ... + 15450.

It is an arithmetic number, because the mean of its divisors is an integer number (7054830).

Almost surely, 2^99955640 is an apocalyptic number.

It is an amenable number.

99955640 is an abundant number, since it is smaller than the sum of its proper divisors (125798920).

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

99955640 is a wasteful number, since it uses less digits than its factorization.

99955640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9503 (or 9499 counting only the distinct ones).

The product of its (nonzero) digits is 437400, while the sum is 47.

The square root of 99955640 is about 9997.7817539692. The cubic root of 99955640 is about 464.0902395833.

The spelling of 99955640 in words is "ninety-nine million, nine hundred fifty-five thousand, six hundred forty".