78265553 has 4 divisors (see below), whose sum is σ = 78671268. Its totient is φ = 77859840.

The previous prime is 78265549. The next prime is 78265609. The reversal of 78265553 is 35556287.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12054784 + 66210769 = 3472^2 + 8137^2 .

It is a cyclic number.

It is not a de Polignac number, because 78265553 - 2² = 78265549 is a prime.

It is a super-2 number, since 2×78265553² = 12250993572791618, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78265553.

It is not an unprimeable number, because it can be changed into a prime (78265753) 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, 202568 + ... + 202953.

It is an arithmetic number, because the mean of its divisors is an integer number (19667817).

Almost surely, 2^78265553 is an apocalyptic number.

It is an amenable number.

78265553 is a deficient number, since it is larger than the sum of its proper divisors (405715).

78265553 is a wasteful number, since it uses less digits than its factorization.

78265553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405714.

The product of its digits is 252000, while the sum is 41.

The square root of 78265553 is about 8846.7820703350. The cubic root of 78265553 is about 427.7501981482.

The spelling of 78265553 in words is "seventy-eight million, two hundred sixty-five thousand, five hundred fifty-three".