610991540 has 24 divisors (see below), whose sum is σ = 1310383872. Its totient is φ = 239196320.

The previous prime is 610991519. The next prime is 610991593. The reversal of 610991540 is 45199016.

It is a self number, because there is not a number n which added to its sum of digits gives 610991540.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 324056 + ... + 325935.

It is an arithmetic number, because the mean of its divisors is an integer number (54599328).

Almost surely, 2^610991540 is an apocalyptic number.

It is an amenable number.

610991540 is an abundant number, since it is smaller than the sum of its proper divisors (699392332).

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

610991540 is a wasteful number, since it uses less digits than its factorization.

610991540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650047 (or 650045 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 610991540 is about 24718.2430605413. The cubic root of 610991540 is about 848.5518779887.

The spelling of 610991540 in words is "six hundred ten million, nine hundred ninety-one thousand, five hundred forty".