5640722538 has 64 divisors (see below), whose sum is σ = 12969621504. Its totient is φ = 1618760000.

The previous prime is 5640722537. The next prime is 5640722539. The reversal of 5640722538 is 8352270465.

It is an interprime number because it is at equal distance from previous prime (5640722537) and next prime (5640722539).

It is a super-2 number, since 2×5640722538² = 63635501501402322888, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 5640722538.

It is not an unprimeable number, because it can be changed into a prime (5640722537) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 134923 + ... + 171713.

It is an arithmetic number, because the mean of its divisors is an integer number (202650336).

Almost surely, 2^5640722538 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5640722538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6484810752).

5640722538 is an abundant number, since it is smaller than the sum of its proper divisors (7328898966).

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

5640722538 is a wasteful number, since it uses less digits than its factorization.

5640722538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36931.

The product of its (nonzero) digits is 403200, while the sum is 42.

The square root of 5640722538 is about 75104.7437782728. The cubic root of 5640722538 is about 1780.1021001486.

The spelling of 5640722538 in words is "five billion, six hundred forty million, seven hundred twenty-two thousand, five hundred thirty-eight".