617988 has 36 divisors (see below), whose sum is σ = 1678992. Its totient is φ = 176400.

The previous prime is 617983. The next prime is 618029. The reversal of 617988 is 889716.

617988 = T₁₆₇ + T₁₆₈ + ... + T₂₀₂.

It is not an unprimeable number, because it can be changed into a prime (617983) by changing a digit.

617988 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63 + ... + 1113.

2⁶¹⁷⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 617988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (839496).

617988 is an abundant number, since it is smaller than the sum of its proper divisors (1061004).

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

617988 is a wasteful number, since it uses less digits than its factorization.

617988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1072 (or 1063 counting only the distinct ones).

The product of its digits is 24192, while the sum is 39.

The square root of 617988 is about 786.1221279165. The cubic root of 617988 is about 85.1778513698.

The spelling of 617988 in words is "six hundred seventeen thousand, nine hundred eighty-eight".