78920523 has 24 divisors (see below), whose sum is σ = 127258560. Its totient is φ = 46715760.

The previous prime is 78920507. The next prime is 78920533. The reversal of 78920523 is 32502987.

It is a happy number.

It is not a de Polignac number, because 78920523 - 2⁴ = 78920507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78920533) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5013 + ... + 13526.

It is an arithmetic number, because the mean of its divisors is an integer number (5302440).

Almost surely, 2^78920523 is an apocalyptic number.

78920523 is a deficient number, since it is larger than the sum of its proper divisors (48338037).

78920523 is a wasteful number, since it uses less digits than its factorization.

78920523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18599 (or 18596 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 78920523 is about 8883.7223617130. The cubic root of 78920523 is about 428.9401028084.

It can be divided in two parts, 789 and 20523, that added together give a palindrome (21312).

The spelling of 78920523 in words is "seventy-eight million, nine hundred twenty thousand, five hundred twenty-three".