78525553 has 4 divisors (see below), whose sum is σ = 79471728. Its totient is φ = 77579380.

The previous prime is 78525547. The next prime is 78525563. The reversal of 78525553 is 35552587.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78525553 - 2⁵ = 78525521 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78525563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 472963 + ... + 473128.

It is an arithmetic number, because the mean of its divisors is an integer number (19867932).

Almost surely, 2^78525553 is an apocalyptic number.

It is an amenable number.

78525553 is a deficient number, since it is larger than the sum of its proper divisors (946175).

78525553 is an equidigital number, since it uses as much as digits as its factorization.

78525553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946174.

The product of its digits is 210000, while the sum is 40.

The square root of 78525553 is about 8861.4644952175. The cubic root of 78525553 is about 428.2233399969.

The spelling of 78525553 in words is "seventy-eight million, five hundred twenty-five thousand, five hundred fifty-three".