78739973 has 6 divisors (see below), whose sum is σ = 85262994. Its totient is φ = 72682896.

The previous prime is 78739963. The next prime is 78739979. The reversal of 78739973 is 37993787.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 2666689 + 76073284 = 1633^2 + 8722^2 .

It is not a de Polignac number, because 78739973 - 2⁴ = 78739957 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 (78739979) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 232790 + ... + 233127.

It is an arithmetic number, because the mean of its divisors is an integer number (14210499).

Almost surely, 2^78739973 is an apocalyptic number.

It is an amenable number.

78739973 is a deficient number, since it is larger than the sum of its proper divisors (6523021).

78739973 is a wasteful number, since it uses less digits than its factorization.

78739973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465943 (or 465930 counting only the distinct ones).

The product of its digits is 2000376, while the sum is 53.

The square root of 78739973 is about 8873.5546992172. The cubic root of 78739973 is about 428.6127512484.

The spelling of 78739973 in words is "seventy-eight million, seven hundred thirty-nine thousand, nine hundred seventy-three".