617990 has 16 divisors (see below), whose sum is σ = 1151280. Its totient is φ = 238560.

The previous prime is 617983. The next prime is 618029. The reversal of 617990 is 99716.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 776 + ... + 1355.

It is an arithmetic number, because the mean of its divisors is an integer number (71955).

2⁶¹⁷⁹⁹⁰ is an apocalyptic number.

617990 is a deficient number, since it is larger than the sum of its proper divisors (533290).

617990 is a wasteful number, since it uses less digits than its factorization.

617990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2167.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 617990 is about 786.1233999825. The cubic root of 617990 is about 85.1779432570.

The spelling of 617990 in words is "six hundred seventeen thousand, nine hundred ninety".