8440650644 has 12 divisors (see below), whose sum is σ = 14771930964. Its totient is φ = 4220098944.

The previous prime is 8440650629. The next prime is 8440650677. The reversal of 8440650644 is 4460560448.

It can be written as a sum of positive squares in 2 ways, for example, as 5683350544 + 2757300100 = 75388^2 + 52510^2 .

It is a super-2 number, since 2×8440650644² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49322 + ... + 138974.

It is an arithmetic number, because the mean of its divisors is an integer number (1230994247).

Almost surely, 2^8440650644 is an apocalyptic number.

It is an amenable number.

8440650644 is a deficient number, since it is larger than the sum of its proper divisors (6331280320).

8440650644 is a wasteful number, since it uses less digits than its factorization.

8440650644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113194 (or 113192 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 41.

The square root of 8440650644 is about 91873.0136873718. The cubic root of 8440650644 is about 2036.0665783517.

The spelling of 8440650644 in words is "eight billion, four hundred forty million, six hundred fifty thousand, six hundred forty-four".