78370993 has 2 divisors, whose sum is σ = 78370994. Its totient is φ = 78370992.

The previous prime is 78370961. The next prime is 78371011. The reversal of 78370993 is 39907387.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44997264 + 33373729 = 6708^2 + 5777^2 .

It is a cyclic number.

It is not a de Polignac number, because 78370993 - 2⁵ = 78370961 is a prime.

It is a super-2 number, since 2×78370993² = 12284025087612098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78370693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39185496 + 39185497.

It is an arithmetic number, because the mean of its divisors is an integer number (39185497).

Almost surely, 2^78370993 is an apocalyptic number.

It is an amenable number.

78370993 is a deficient number, since it is larger than the sum of its proper divisors (1).

78370993 is an equidigital number, since it uses as much as digits as its factorization.

78370993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 285768, while the sum is 46.

The square root of 78370993 is about 8852.7392935746. The cubic root of 78370993 is about 427.9422014855.

The spelling of 78370993 in words is "seventy-eight million, three hundred seventy thousand, nine hundred ninety-three".