99997764 has 24 divisors (see below), whose sum is σ = 238293888. Its totient is φ = 32623200.

The previous prime is 99997759. The next prime is 99997769. The reversal of 99997764 is 46779999.

It is an interprime number because it is at equal distance from previous prime (99997759) and next prime (99997769).

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 99997698 and 99997707.

It is not an unprimeable number, because it can be changed into a prime (99997769) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88087 + ... + 89214.

It is an arithmetic number, because the mean of its divisors is an integer number (9928912).

Almost surely, 2^99997764 is an apocalyptic number.

99997764 is a gapful number since it is divisible by the number (94) formed by its first and last digit.

It is an amenable number.

99997764 is an abundant number, since it is smaller than the sum of its proper divisors (138296124).

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

99997764 is a wasteful number, since it uses less digits than its factorization.

99997764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177355 (or 177353 counting only the distinct ones).

The product of its digits is 7715736, while the sum is 60.

The square root of 99997764 is about 9999.8881993750. Note that the first 3 decimals coincide. The cubic root of 99997764 is about 464.1554238046.

The spelling of 99997764 in words is "ninety-nine million, nine hundred ninety-seven thousand, seven hundred sixty-four".