617971794 has 128 divisors (see below), whose sum is σ = 1496309760. Its totient is φ = 167961600.

The previous prime is 617971793. The next prime is 617971799. The reversal of 617971794 is 497179716.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (617971793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3791157 + ... + 3791319.

It is an arithmetic number, because the mean of its divisors is an integer number (11689920).

Almost surely, 2^617971794 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 617971794, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (748154880).

617971794 is an abundant number, since it is smaller than the sum of its proper divisors (878337966).

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

617971794 is a wasteful number, since it uses less digits than its factorization.

617971794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336.

The product of its digits is 666792, while the sum is 51.

The square root of 617971794 is about 24859.0384769806. The cubic root of 617971794 is about 851.7710680073.

The spelling of 617971794 in words is "six hundred seventeen million, nine hundred seventy-one thousand, seven hundred ninety-four".