78764693 has 4 divisors (see below), whose sum is σ = 90016800. Its totient is φ = 67512588.

The previous prime is 78764681. The next prime is 78764711. The reversal of 78764693 is 39646787.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39646787 = 19 ⋅2086673.

It is a cyclic number.

It is not a de Polignac number, because 78764693 - 2⁶ = 78764629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78764393) 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, 5626043 + ... + 5626056.

It is an arithmetic number, because the mean of its divisors is an integer number (22504200).

Almost surely, 2^78764693 is an apocalyptic number.

It is an amenable number.

78764693 is a deficient number, since it is larger than the sum of its proper divisors (11252107).

78764693 is a wasteful number, since it uses less digits than its factorization.

78764693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11252106.

The product of its digits is 1524096, while the sum is 50.

The square root of 78764693 is about 8874.9474928024. The cubic root of 78764693 is about 428.6576001276.

The spelling of 78764693 in words is "seventy-eight million, seven hundred sixty-four thousand, six hundred ninety-three".