99997758 has 24 divisors (see below), whose sum is σ = 247613808. Its totient is φ = 28570752.

The previous prime is 99997691. The next prime is 99997759. The reversal of 99997758 is 85779999.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 99997695 and 99997704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99997759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 396691 + ... + 396942.

It is an arithmetic number, because the mean of its divisors is an integer number (10317242).

Almost surely, 2^99997758 is an apocalyptic number.

99997758 is an abundant number, since it is smaller than the sum of its proper divisors (147616050).

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

99997758 is a wasteful number, since it uses less digits than its factorization.

99997758 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793648 (or 793645 counting only the distinct ones).

The product of its digits is 12859560, while the sum is 63.

The square root of 99997758 is about 9999.8878993717. The cubic root of 99997758 is about 464.1554145213.

The spelling of 99997758 in words is "ninety-nine million, nine hundred ninety-seven thousand, seven hundred fifty-eight".