78268761 has 20 divisors (see below), whose sum is σ = 117228672. Its totient is φ = 52041528.

The previous prime is 78268759. The next prime is 78268777. The reversal of 78268761 is 16786287.

It is not a de Polignac number, because 78268761 - 2¹ = 78268759 is a prime.

It is a super-2 number, since 2×78268761² = 12251997896950242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78268741) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 36460 + ... + 38546.

Almost surely, 2^78268761 is an apocalyptic number.

It is an amenable number.

78268761 is a deficient number, since it is larger than the sum of its proper divisors (38959911).

78268761 is a wasteful number, since it uses less digits than its factorization.

78268761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2562 (or 2553 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The square root of 78268761 is about 8846.9633773403. The cubic root of 78268761 is about 427.7560423706.

The spelling of 78268761 in words is "seventy-eight million, two hundred sixty-eight thousand, seven hundred sixty-one".