7021644040 has 16 divisors (see below), whose sum is σ = 15798699180. Its totient is φ = 2808657600.

The previous prime is 7021644037. The next prime is 7021644041. The reversal of 7021644040 is 404461207.

It can be written as a sum of positive squares in 2 ways, for example, as 6665416164 + 356227876 = 81642^2 + 18874^2 .

It is not an unprimeable number, because it can be changed into a prime (7021644041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87770511 + ... + 87770590.

Almost surely, 2^7021644040 is an apocalyptic number.

It is an amenable number.

7021644040 is an abundant number, since it is smaller than the sum of its proper divisors (8777055140).

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

7021644040 is a wasteful number, since it uses less digits than its factorization.

7021644040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175541112 (or 175541108 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 7021644040 is about 83795.2507007408. The cubic root of 7021644040 is about 1914.9007522411.

The spelling of 7021644040 in words is "seven billion, twenty-one million, six hundred forty-four thousand, forty".