7139447820 has 72 divisors (see below), whose sum is σ = 21667319856. Its totient is φ = 1902886272.

The previous prime is 7139447807. The next prime is 7139447837. The reversal of 7139447820 is 287449317.

7139447820 is a `hidden beast` number, since 71 + 3 + 94 + 478 + 20 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 389379 + ... + 407301.

It is an arithmetic number, because the mean of its divisors is an integer number (300934998).

Almost surely, 2^7139447820 is an apocalyptic number.

It is an amenable number.

7139447820 is an abundant number, since it is smaller than the sum of its proper divisors (14527872036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7139447820 is a wasteful number, since it uses less digits than its factorization.

7139447820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20151 (or 20146 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 7139447820 is about 84495.2532394572. The cubic root of 7139447820 is about 1925.5503296386.

The spelling of 7139447820 in words is "seven billion, one hundred thirty-nine million, four hundred forty-seven thousand, eight hundred twenty".