78099953 has 4 divisors (see below), whose sum is σ = 79088640. Its totient is φ = 77111268.

The previous prime is 78099941. The next prime is 78099961. The reversal of 78099953 is 35999087.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 78099953 - 2¹⁰ = 78098929 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78099913) 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, 494225 + ... + 494382.

It is an arithmetic number, because the mean of its divisors is an integer number (19772160).

Almost surely, 2^78099953 is an apocalyptic number.

It is an amenable number.

78099953 is a deficient number, since it is larger than the sum of its proper divisors (988687).

78099953 is an equidigital number, since it uses as much as digits as its factorization.

78099953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988686.

The product of its (nonzero) digits is 612360, while the sum is 50.

The square root of 78099953 is about 8837.4177789669. The cubic root of 78099953 is about 427.4482967007.

The spelling of 78099953 in words is "seventy-eight million, ninety-nine thousand, nine hundred fifty-three".