78812073 has 6 divisors (see below), whose sum is σ = 113839674. Its totient is φ = 52541376.

The previous prime is 78812047. The next prime is 78812131. The reversal of 78812073 is 37021887.

It can be written as a sum of positive squares in only one way, i.e., 55308969 + 23503104 = 7437^2 + 4848^2 .

It is not a de Polignac number, because 78812073 - 2¹⁰ = 78811049 is a prime.

It is a super-2 number, since 2×78812073² = 12422685701114658, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78812003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4378440 + ... + 4378457.

It is an arithmetic number, because the mean of its divisors is an integer number (18973279).

Almost surely, 2^78812073 is an apocalyptic number.

It is an amenable number.

78812073 is a deficient number, since it is larger than the sum of its proper divisors (35027601).

78812073 is a wasteful number, since it uses less digits than its factorization.

78812073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8756903 (or 8756900 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 78812073 is about 8877.6164030668. The cubic root of 78812073 is about 428.7435342575.

The spelling of 78812073 in words is "seventy-eight million, eight hundred twelve thousand, seventy-three".