9999999750 has 64 divisors (see below), whose sum is σ = 26880025536. Its totient is φ = 2461536000.

The previous prime is 9999999727. The next prime is 9999999769. The reversal of 9999999750 is 579999999.

It is a Harshad number since it is a multiple of its sum of digits (75).

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 503071 + ... + 522570.

It is an arithmetic number, because the mean of its divisors is an integer number (420000399).

Almost surely, 2^9999999750 is an apocalyptic number.

9999999750 is an abundant number, since it is smaller than the sum of its proper divisors (16880025786).

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

9999999750 is a wasteful number, since it uses less digits than its factorization.

9999999750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025674 (or 1025664 counting only the distinct ones).

The product of its (nonzero) digits is 167403915, while the sum is 75.

The square root of 9999999750 is about 99999.9987500000. The cubic root of 9999999750 is about 2154.4346720783.

The spelling of 9999999750 in words is "nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, seven hundred fifty".