78740723 has 4 divisors (see below), whose sum is σ = 78759408. Its totient is φ = 78722040.

The previous prime is 78740687. The next prime is 78740729. The reversal of 78740723 is 32704787.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32704787 = 17 ⋅1923811.

It is a cyclic number.

It is not a de Polignac number, because 78740723 - 2⁶ = 78740659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78740729) 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, 290 + ... + 12552.

It is an arithmetic number, because the mean of its divisors is an integer number (19689852).

Almost surely, 2^78740723 is an apocalyptic number.

78740723 is a deficient number, since it is larger than the sum of its proper divisors (18685).

78740723 is a wasteful number, since it uses less digits than its factorization.

78740723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18684.

The product of its (nonzero) digits is 65856, while the sum is 38.

The square root of 78740723 is about 8873.5969595199. The cubic root of 78740723 is about 428.6141120927.

The spelling of 78740723 in words is "seventy-eight million, seven hundred forty thousand, seven hundred twenty-three".