78885553 has 2 divisors, whose sum is σ = 78885554. Its totient is φ = 78885552.

The previous prime is 78885503. The next prime is 78885557. The reversal of 78885553 is 35558887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57881664 + 21003889 = 7608^2 + 4583^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78885553 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78885497 and 78885506.

It is not a weakly prime, because it can be changed into another prime (78885557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39442776 + 39442777.

It is an arithmetic number, because the mean of its divisors is an integer number (39442777).

Almost surely, 2^78885553 is an apocalyptic number.

It is an amenable number.

78885553 is a deficient number, since it is larger than the sum of its proper divisors (1).

78885553 is an equidigital number, since it uses as much as digits as its factorization.

78885553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344000, while the sum is 49.

The square root of 78885553 is about 8881.7539371455. The cubic root of 78885553 is about 428.8767384223.

The spelling of 78885553 in words is "seventy-eight million, eight hundred eighty-five thousand, five hundred fifty-three".