99663750 has 80 divisors (see below), whose sum is σ = 276848880. Its totient is φ = 26568000.

The previous prime is 99663737. The next prime is 99663821. The reversal of 99663750 is 5736699.

99663750 is a `hidden beast` number, since 9 + 9 + 6 + 637 + 5 + 0 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 99663696 and 99663705.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 32274 + ... + 35226.

It is an arithmetic number, because the mean of its divisors is an integer number (3460611).

Almost surely, 2^99663750 is an apocalyptic number.

99663750 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 99663750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138424440).

99663750 is an abundant number, since it is smaller than the sum of its proper divisors (177185130).

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

99663750 is a wasteful number, since it uses less digits than its factorization.

99663750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2984 (or 2963 counting only the distinct ones).

The product of its (nonzero) digits is 306180, while the sum is 45.

The square root of 99663750 is about 9983.1733431810. The cubic root of 99663750 is about 463.6380544135.

It can be divided in two parts, 996 and 63750, that added together give a palindrome (64746).

The spelling of 99663750 in words is "ninety-nine million, six hundred sixty-three thousand, seven hundred fifty".