99991260 has 60 divisors (see below), whose sum is σ = 313681368. Its totient is φ = 26663904.

The previous prime is 99991249. The next prime is 99991271. The reversal of 99991260 is 6219999.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (99991249) and next prime (99991271).

It is a tau number, because it is divible by the number of its divisors (60).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 29242 + ... + 32481.

Almost surely, 2^99991260 is an apocalyptic number.

99991260 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

99991260 is an abundant number, since it is smaller than the sum of its proper divisors (213690108).

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

99991260 is a wasteful number, since it uses less digits than its factorization.

99991260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61744 (or 61733 counting only the distinct ones).

The product of its (nonzero) digits is 78732, while the sum is 45.

The square root of 99991260 is about 9999.5629904511. The cubic root of 99991260 is about 464.1453604718.

The spelling of 99991260 in words is "ninety-nine million, nine hundred ninety-one thousand, two hundred sixty".