7861224872 has 32 divisors (see below), whose sum is σ = 15195577320. Its totient is φ = 3810293760.

The previous prime is 7861224857. The next prime is 7861224883. The reversal of 7861224872 is 2784221687.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3710515396 + 4150709476 = 60914^2 + 64426^2 .

It is a super-3 number, since 3×7861224872³ (a number of 31 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24833 + ... + 127824.

Almost surely, 2^7861224872 is an apocalyptic number.

It is an amenable number.

7861224872 is a deficient number, since it is larger than the sum of its proper divisors (7334352448).

7861224872 is a wasteful number, since it uses less digits than its factorization.

7861224872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152861 (or 152857 counting only the distinct ones).

The product of its digits is 602112, while the sum is 47.

The square root of 7861224872 is about 88663.5487221214. The cubic root of 7861224872 is about 1988.3678840979.

The spelling of 7861224872 in words is "seven billion, eight hundred sixty-one million, two hundred twenty-four thousand, eight hundred seventy-two".