78255575 has 12 divisors (see below), whose sum is σ = 97173840. Its totient is φ = 62516160.

The previous prime is 78255557. The next prime is 78255577. The reversal of 78255575 is 57555287.

It is not a de Polignac number, because 78255575 - 2¹⁰ = 78254551 is a prime.

It is a super-2 number, since 2×78255575² = 12247870037161250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78255577) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20411 + ... + 23939.

It is an arithmetic number, because the mean of its divisors is an integer number (8097820).

Almost surely, 2^78255575 is an apocalyptic number.

78255575 is a deficient number, since it is larger than the sum of its proper divisors (18918265).

78255575 is a wasteful number, since it uses less digits than its factorization.

78255575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4426 (or 4421 counting only the distinct ones).

The product of its digits is 490000, while the sum is 44.

The square root of 78255575 is about 8846.2181184956. The cubic root of 78255575 is about 427.7320195554.

The spelling of 78255575 in words is "seventy-eight million, two hundred fifty-five thousand, five hundred seventy-five".