7872779943 has 24 divisors (see below), whose sum is σ = 13313323296. Its totient is φ = 4389004800.

The previous prime is 7872779899. The next prime is 7872779989. The reversal of 7872779943 is 3499772787.

It is not a de Polignac number, because 7872779943 - 2⁶ = 7872779879 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7872775943) 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, 1521378 + ... + 1526543.

It is an arithmetic number, because the mean of its divisors is an integer number (554721804).

Almost surely, 2^7872779943 is an apocalyptic number.

7872779943 is a deficient number, since it is larger than the sum of its proper divisors (5440543353).

7872779943 is a wasteful number, since it uses less digits than its factorization.

7872779943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3047975 (or 3047972 counting only the distinct ones).

The product of its digits is 37340352, while the sum is 63.

The square root of 7872779943 is about 88728.6872606600. The cubic root of 7872779943 is about 1989.3416290477.

The spelling of 7872779943 in words is "seven billion, eight hundred seventy-two million, seven hundred seventy-nine thousand, nine hundred forty-three".