610640440 has 32 divisors (see below), whose sum is σ = 1386791280. Its totient is φ = 241971712.

The previous prime is 610640431. The next prime is 610640447. The reversal of 610640440 is 44046016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (610640447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67057 + ... + 75616.

Almost surely, 2^610640440 is an apocalyptic number.

It is an amenable number.

610640440 is an abundant number, since it is smaller than the sum of its proper divisors (776150840).

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

610640440 is a wasteful number, since it uses less digits than its factorization.

610640440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142791 (or 142787 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 610640440 is about 24711.1399979847. The cubic root of 610640440 is about 848.3893096443.

Adding to 610640440 its reverse (44046016), we get a palindrome (654686456).

The spelling of 610640440 in words is "six hundred ten million, six hundred forty thousand, four hundred forty".