78812077 has 4 divisors (see below), whose sum is σ = 80644960. Its totient is φ = 76979196.

The previous prime is 78812047. The next prime is 78812131. The reversal of 78812077 is 77021887.

It is a happy number.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78812077 is a prime.

It is a super-2 number, since 2×78812077² = 12422686962107858, 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 (78812047) 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, 916377 + ... + 916462.

It is an arithmetic number, because the mean of its divisors is an integer number (20161240).

Almost surely, 2^78812077 is an apocalyptic number.

It is an amenable number.

78812077 is a deficient number, since it is larger than the sum of its proper divisors (1832883).

78812077 is a wasteful number, since it uses less digits than its factorization.

78812077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1832882.

The product of its (nonzero) digits is 43904, while the sum is 40.

The square root of 78812077 is about 8877.6166283525. The cubic root of 78812077 is about 428.7435415109.

The spelling of 78812077 in words is "seventy-eight million, eight hundred twelve thousand, seventy-seven".