99755640 has 48 divisors (see below), whose sum is σ = 324207000. Its totient is φ = 26601408.

The previous prime is 99755633. The next prime is 99755641. The reversal of 99755640 is 4655799.

It is a happy number.

99755640 is a `hidden beast` number, since 9 + 97 + 556 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99755641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 138190 + ... + 138909.

Almost surely, 2^99755640 is an apocalyptic number.

99755640 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

99755640 is an abundant number, since it is smaller than the sum of its proper divisors (224451360).

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

99755640 is a wasteful number, since it uses less digits than its factorization.

99755640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277116 (or 277109 counting only the distinct ones).

The product of its (nonzero) digits is 340200, while the sum is 45.

The square root of 99755640 is about 9987.7745268904. The cubic root of 99755640 is about 463.7805021071.

The spelling of 99755640 in words is "ninety-nine million, seven hundred fifty-five thousand, six hundred forty".