78255939 has 8 divisors (see below), whose sum is σ = 104386320. Its totient is φ = 52148096.

The previous prime is 78255937. The next prime is 78255943. The reversal of 78255939 is 93955287.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78255939 - 2¹ = 78255937 is a prime.

It is a super-2 number, since 2×78255939² = 12247983977543442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78255937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5767 + ... + 13775.

It is an arithmetic number, because the mean of its divisors is an integer number (13048290).

Almost surely, 2^78255939 is an apocalyptic number.

78255939 is a deficient number, since it is larger than the sum of its proper divisors (26130381).

78255939 is a wasteful number, since it uses less digits than its factorization.

78255939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11269.

The product of its digits is 680400, while the sum is 48.

The square root of 78255939 is about 8846.2386922352. The cubic root of 78255939 is about 427.7326827422.

The spelling of 78255939 in words is "seventy-eight million, two hundred fifty-five thousand, nine hundred thirty-nine".