7918728436 has 12 divisors (see below), whose sum is σ = 14047607812. Its totient is φ = 3905126208.

The previous prime is 7918728403. The next prime is 7918728449. The reversal of 7918728436 is 6348278197.

It can be written as a sum of positive squares in 2 ways, for example, as 6863128336 + 1055600100 = 82844^2 + 32490^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13559175 + ... + 13559758.

Almost surely, 2^7918728436 is an apocalyptic number.

It is an amenable number.

7918728436 is a deficient number, since it is larger than the sum of its proper divisors (6128879376).

7918728436 is a wasteful number, since it uses less digits than its factorization.

7918728436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27119010 (or 27119008 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 55.

The square root of 7918728436 is about 88987.2374894288. The cubic root of 7918728436 is about 1993.2043050849.

The spelling of 7918728436 in words is "seven billion, nine hundred eighteen million, seven hundred twenty-eight thousand, four hundred thirty-six".