78953669 has 2 divisors, whose sum is σ = 78953670. Its totient is φ = 78953668.

The previous prime is 78953663. The next prime is 78953713. The reversal of 78953669 is 96635987.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67650625 + 11303044 = 8225^2 + 3362^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78953669 is a prime.

It is a super-2 number, since 2×78953669² = 12467363697123122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78953669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78953663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39476834 + 39476835.

It is an arithmetic number, because the mean of its divisors is an integer number (39476835).

Almost surely, 2^78953669 is an apocalyptic number.

It is an amenable number.

78953669 is a deficient number, since it is larger than the sum of its proper divisors (1).

78953669 is an equidigital number, since it uses as much as digits as its factorization.

78953669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2449440, while the sum is 53.

The square root of 78953669 is about 8885.5877126952. The cubic root of 78953669 is about 429.0001448952. Note that the first 3 decimals are identical.

The spelling of 78953669 in words is "seventy-eight million, nine hundred fifty-three thousand, six hundred sixty-nine".