7863721290 has 48 divisors (see below), whose sum is σ = 20692028448. Its totient is φ = 2071725408.

The previous prime is 7863721267. The next prime is 7863721319. The reversal of 7863721290 is 921273687.

7863721290 is a `hidden beast` number, since 7 + 8 + 637 + 2 + 1 + 2 + 9 + 0 = 666.

It is a super-2 number, since 2×7863721290² (a number of 21 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 518884 + ... + 533823.

It is an arithmetic number, because the mean of its divisors is an integer number (431083926).

Almost surely, 2^7863721290 is an apocalyptic number.

7863721290 is an abundant number, since it is smaller than the sum of its proper divisors (12828307158).

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

7863721290 is a wasteful number, since it uses less digits than its factorization.

7863721290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1052803 (or 1052800 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The square root of 7863721290 is about 88677.6256448040. The cubic root of 7863721290 is about 1988.5783378170.

The spelling of 7863721290 in words is "seven billion, eight hundred sixty-three million, seven hundred twenty-one thousand, two hundred ninety".