78252553 has 2 divisors, whose sum is σ = 78252554. Its totient is φ = 78252552.

The previous prime is 78252529. The next prime is 78252557. The reversal of 78252553 is 35525287.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76685049 + 1567504 = 8757^2 + 1252^2 .

It is a cyclic number.

It is not a de Polignac number, because 78252553 - 2¹⁷ = 78121481 is a prime.

It is a super-2 number, since 2×78252553² = 12246924102035618, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78252557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39126276 + 39126277.

It is an arithmetic number, because the mean of its divisors is an integer number (39126277).

Almost surely, 2^78252553 is an apocalyptic number.

It is an amenable number.

78252553 is a deficient number, since it is larger than the sum of its proper divisors (1).

78252553 is an equidigital number, since it uses as much as digits as its factorization.

78252553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84000, while the sum is 37.

The square root of 78252553 is about 8846.0473093919. The cubic root of 78252553 is about 427.7265135672.

It can be divided in two parts, 782 and 52553, that added together give a palindrome (53335).

The spelling of 78252553 in words is "seventy-eight million, two hundred fifty-two thousand, five hundred fifty-three".