99780293 has 4 divisors (see below), whose sum is σ = 105649740. Its totient is φ = 93910848.

The previous prime is 99780283. The next prime is 99780299. The reversal of 99780293 is 39208799.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 85507009 + 14273284 = 9247^2 + 3778^2 .

It is a cyclic number.

It is not a de Polignac number, because 99780293 - 2⁴ = 99780277 is a prime.

It is a super-2 number, since 2×99780293² = 19912213742331698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99780299) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2934698 + ... + 2934731.

It is an arithmetic number, because the mean of its divisors is an integer number (26412435).

Almost surely, 2^99780293 is an apocalyptic number.

It is an amenable number.

99780293 is a deficient number, since it is larger than the sum of its proper divisors (5869447).

99780293 is a wasteful number, since it uses less digits than its factorization.

99780293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5869446.

The product of its (nonzero) digits is 244944, while the sum is 47.

The square root of 99780293 is about 9989.0086094667. The cubic root of 99780293 is about 463.8187042544.

The spelling of 99780293 in words is "ninety-nine million, seven hundred eighty thousand, two hundred ninety-three".