78255525 has 24 divisors (see below), whose sum is σ = 129929184. Its totient is φ = 41560000.

The previous prime is 78255503. The next prime is 78255533. The reversal of 78255525 is 52555287.

It is not a de Polignac number, because 78255525 - 2¹¹ = 78253477 is a prime.

It is a super-2 number, since 2×78255525² = 12247854386051250, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16747 + ... + 20903.

It is an arithmetic number, because the mean of its divisors is an integer number (5413716).

Almost surely, 2^78255525 is an apocalyptic number.

78255525 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78255525 is a deficient number, since it is larger than the sum of its proper divisors (51673659).

78255525 is a wasteful number, since it uses less digits than its factorization.

78255525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4421 (or 4416 counting only the distinct ones).

The product of its digits is 140000, while the sum is 39.

The square root of 78255525 is about 8846.2152924287. The cubic root of 78255525 is about 427.7319284581.

The spelling of 78255525 in words is "seventy-eight million, two hundred fifty-five thousand, five hundred twenty-five".