7878723 has 8 divisors (see below), whose sum is σ = 10537488. Its totient is φ = 5236224.

The previous prime is 7878721. The next prime is 7878763. The reversal of 7878723 is 3278787.

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

It is not a de Polignac number, because 7878723 - 2¹ = 7878721 is a prime.

It is a super-2 number, since 2×7878723² = 124148552221458, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (7878721) 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, 2886 + ... + 4907.

It is an arithmetic number, because the mean of its divisors is an integer number (1317186).

Almost surely, 2^7878723 is an apocalyptic number.

7878723 is a deficient number, since it is larger than the sum of its proper divisors (2658765).

7878723 is a wasteful number, since it uses less digits than its factorization.

7878723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8133.

The product of its digits is 131712, while the sum is 42.

The square root of 7878723 is about 2806.9063041007. The cubic root of 7878723 is about 198.9842078998.

The spelling of 7878723 in words is "seven million, eight hundred seventy-eight thousand, seven hundred twenty-three".