78938761 has 8 divisors (see below), whose sum is σ = 86210784. Its totient is φ = 71682720.

The previous prime is 78938719. The next prime is 78938767. The reversal of 78938761 is 16783987.

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 78938761 - 2¹⁷ = 78807689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78938767) 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, 7890 + ... + 14836.

It is an arithmetic number, because the mean of its divisors is an integer number (10776348).

Almost surely, 2^78938761 is an apocalyptic number.

It is an amenable number.

78938761 is a deficient number, since it is larger than the sum of its proper divisors (7272023).

78938761 is a wasteful number, since it uses less digits than its factorization.

78938761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7991.

The product of its digits is 508032, while the sum is 49.

The square root of 78938761 is about 8884.7487865443. The cubic root of 78938761 is about 428.9731419840.

It can be divided in two parts, 78 and 938761, that added together give a palindrome (938839).

The spelling of 78938761 in words is "seventy-eight million, nine hundred thirty-eight thousand, seven hundred sixty-one".