78372331 has 2 divisors, whose sum is σ = 78372332. Its totient is φ = 78372330.

The previous prime is 78372277. The next prime is 78372337. The reversal of 78372331 is 13327387.

It is a strong prime.

It is an emirp because it is prime and its reverse (13327387) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78372331 - 2¹¹ = 78370283 is a prime.

It is a super-2 number, since 2×78372331² = 12284444532747122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78372337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39186165 + 39186166.

It is an arithmetic number, because the mean of its divisors is an integer number (39186166).

Almost surely, 2^78372331 is an apocalyptic number.

78372331 is a deficient number, since it is larger than the sum of its proper divisors (1).

78372331 is an equidigital number, since it uses as much as digits as its factorization.

78372331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 34.

The square root of 78372331 is about 8852.8148630817. The cubic root of 78372331 is about 427.9446368398.

The spelling of 78372331 in words is "seventy-eight million, three hundred seventy-two thousand, three hundred thirty-one".