78255751 has 4 divisors (see below), whose sum is σ = 89435152. Its totient is φ = 67076352.

The previous prime is 78255733. The next prime is 78255769. The reversal of 78255751 is 15755287.

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

It is an interprime number because it is at equal distance from previous prime (78255733) and next prime (78255769).

It is not a de Polignac number, because 78255751 - 2⁹ = 78255239 is a prime.

It is a super-2 number, since 2×78255751² = 12247925129148002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78255721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5589690 + ... + 5589703.

It is an arithmetic number, because the mean of its divisors is an integer number (22358788).

Almost surely, 2^78255751 is an apocalyptic number.

78255751 is a deficient number, since it is larger than the sum of its proper divisors (11179401).

78255751 is a wasteful number, since it uses less digits than its factorization.

78255751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11179400.

The product of its digits is 98000, while the sum is 40.

The square root of 78255751 is about 8846.2280662438. The cubic root of 78255751 is about 427.7323402174.

The spelling of 78255751 in words is "seventy-eight million, two hundred fifty-five thousand, seven hundred fifty-one".