78990113 has 4 divisors (see below), whose sum is σ = 81713940. Its totient is φ = 76266288.

The previous prime is 78990103. The next prime is 78990133. The reversal of 78990113 is 31109987.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31109987 = 271 ⋅114797.

It can be written as a sum of positive squares in 2 ways, for example, as 46076944 + 32913169 = 6788^2 + 5737^2 .

It is not a de Polignac number, because 78990113 - 2¹⁴ = 78973729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78990103) 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, 1361870 + ... + 1361927.

It is an arithmetic number, because the mean of its divisors is an integer number (20428485).

Almost surely, 2^78990113 is an apocalyptic number.

It is an amenable number.

78990113 is a deficient number, since it is larger than the sum of its proper divisors (2723827).

78990113 is a wasteful number, since it uses less digits than its factorization.

78990113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2723826.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 78990113 is about 8887.6382127087. The cubic root of 78990113 is about 429.0661417283.

The spelling of 78990113 in words is "seventy-eight million, nine hundred ninety thousand, one hundred thirteen".