78873953 has 2 divisors, whose sum is σ = 78873954. Its totient is φ = 78873952.

The previous prime is 78873947. The next prime is 78873979. The reversal of 78873953 is 35937887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43256929 + 35617024 = 6577^2 + 5968^2 .

It is a cyclic number.

It is not a de Polignac number, because 78873953 - 2⁴ = 78873937 is a prime.

It is a super-2 number, since 2×78873953² = 12442200923692418, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78873913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39436976 + 39436977.

It is an arithmetic number, because the mean of its divisors is an integer number (39436977).

Almost surely, 2^78873953 is an apocalyptic number.

It is an amenable number.

78873953 is a deficient number, since it is larger than the sum of its proper divisors (1).

78873953 is an equidigital number, since it uses as much as digits as its factorization.

78873953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1270080, while the sum is 50.

The square root of 78873953 is about 8881.1008889664. The cubic root of 78873953 is about 428.8557155022.

The spelling of 78873953 in words is "seventy-eight million, eight hundred seventy-three thousand, nine hundred fifty-three".