78786941 has 4 divisors (see below), whose sum is σ = 78804732. Its totient is φ = 78769152.

The previous prime is 78786923. The next prime is 78786943. The reversal of 78786941 is 14968787.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 77070841 + 1716100 = 8779^2 + 1310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78786941 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78786941.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78786943) 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, 3581 + ... + 13053.

It is an arithmetic number, because the mean of its divisors is an integer number (19701183).

Almost surely, 2^78786941 is an apocalyptic number.

It is an amenable number.

78786941 is a deficient number, since it is larger than the sum of its proper divisors (17791).

78786941 is an equidigital number, since it uses as much as digits as its factorization.

78786941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17790.

The product of its digits is 677376, while the sum is 50.

The square root of 78786941 is about 8876.2008201708. The cubic root of 78786941 is about 428.6979560965.

The spelling of 78786941 in words is "seventy-eight million, seven hundred eighty-six thousand, nine hundred forty-one".