7278557013 has 24 divisors (see below), whose sum is σ = 12939658368. Its totient is φ = 3839238432.

The previous prime is 7278557003. The next prime is 7278557057. The reversal of 7278557013 is 3107558727.

7278557013 is a `hidden beast` number, since 7 + 2 + 78 + 5 + 570 + 1 + 3 = 666.

It is not a de Polignac number, because 7278557013 - 2⁶ = 7278556949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7278557013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7278557003) 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, 4442745 + ... + 4444382.

It is an arithmetic number, because the mean of its divisors is an integer number (539152432).

Almost surely, 2^7278557013 is an apocalyptic number.

It is an amenable number.

7278557013 is a deficient number, since it is larger than the sum of its proper divisors (5661101355).

7278557013 is a wasteful number, since it uses less digits than its factorization.

7278557013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8887153 (or 8887150 counting only the distinct ones).

The product of its (nonzero) digits is 411600, while the sum is 45.

The square root of 7278557013 is about 85314.4595774948. The cubic root of 7278557013 is about 1937.9761560646.

The spelling of 7278557013 in words is "seven billion, two hundred seventy-eight million, five hundred fifty-seven thousand, thirteen".