610646399 has 4 divisors (see below), whose sum is σ = 666159720. Its totient is φ = 555133080.

The previous prime is 610646381. The next prime is 610646423. The reversal of 610646399 is 993646016.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 610646399 - 2⁸ = 610646143 is a prime.

It is a super-2 number, since 2×610646399² = 745778049223334402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (610646369) 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, 27756644 + ... + 27756665.

It is an arithmetic number, because the mean of its divisors is an integer number (166539930).

Almost surely, 2^610646399 is an apocalyptic number.

610646399 is a deficient number, since it is larger than the sum of its proper divisors (55513321).

610646399 is a wasteful number, since it uses less digits than its factorization.

610646399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55513320.

The product of its (nonzero) digits is 209952, while the sum is 44.

The square root of 610646399 is about 24711.2605708410. The cubic root of 610646399 is about 848.3920693345.

The spelling of 610646399 in words is "six hundred ten million, six hundred forty-six thousand, three hundred ninety-nine".