78972763 has 4 divisors (see below), whose sum is σ = 81107200. Its totient is φ = 76838328.

The previous prime is 78972749. The next prime is 78972781. The reversal of 78972763 is 36727987.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36727987 = 23 ⋅1596869.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78972763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78972743) 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, 1067163 + ... + 1067236.

It is an arithmetic number, because the mean of its divisors is an integer number (20276800).

Almost surely, 2^78972763 is an apocalyptic number.

78972763 is a deficient number, since it is larger than the sum of its proper divisors (2134437).

78972763 is a wasteful number, since it uses less digits than its factorization.

78972763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2134436.

The product of its digits is 889056, while the sum is 49.

The square root of 78972763 is about 8886.6620842699. The cubic root of 78972763 is about 429.0347249581.

The spelling of 78972763 in words is "seventy-eight million, nine hundred seventy-two thousand, seven hundred sixty-three".