78920481 has 4 divisors (see below), whose sum is σ = 105227312. Its totient is φ = 52613652.

The previous prime is 78920453. The next prime is 78920489. The reversal of 78920481 is 18402987.

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.

It is not a de Polignac number, because 78920481 - 2²² = 74726177 is a prime.

It is a super-2 number, since 2×78920481² = 12456884642542722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78920489) 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, 13153411 + ... + 13153416.

It is an arithmetic number, because the mean of its divisors is an integer number (26306828).

Almost surely, 2^78920481 is an apocalyptic number.

It is an amenable number.

78920481 is a deficient number, since it is larger than the sum of its proper divisors (26306831).

78920481 is a wasteful number, since it uses less digits than its factorization.

78920481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26306830.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 78920481 is about 8883.7199978387. The cubic root of 78920481 is about 428.9400267171.

It can be divided in two parts, 78920 and 481, that added together give a triangular number (79401 = T₃₉₈).

The spelling of 78920481 in words is "seventy-eight million, nine hundred twenty thousand, four hundred eighty-one".