78723951 has 8 divisors (see below), whose sum is σ = 108584880. Its totient is φ = 50672832.

The previous prime is 78723949. The next prime is 78723961. The reversal of 78723951 is 15932787.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78723951 - 2¹ = 78723949 is a prime.

It is a super-2 number, since 2×78723951² = 12394920922100802, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78723941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 452350 + ... + 452523.

It is an arithmetic number, because the mean of its divisors is an integer number (13573110).

Almost surely, 2^78723951 is an apocalyptic number.

78723951 is a deficient number, since it is larger than the sum of its proper divisors (29860929).

78723951 is a wasteful number, since it uses less digits than its factorization.

78723951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 904905.

The product of its digits is 105840, while the sum is 42.

The square root of 78723951 is about 8872.6518583792. The cubic root of 78723951 is about 428.5836779197.

The spelling of 78723951 in words is "seventy-eight million, seven hundred twenty-three thousand, nine hundred fifty-one".