617420388 has 96 divisors (see below), whose sum is σ = 1601316864. Its totient is φ = 183961728.

The previous prime is 617420387. The next prime is 617420407. The reversal of 617420388 is 883024716.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (617420387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 784131 + ... + 784917.

It is an arithmetic number, because the mean of its divisors is an integer number (16680384).

Almost surely, 2^617420388 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 617420388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (800658432).

617420388 is an abundant number, since it is smaller than the sum of its proper divisors (983896476).

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

617420388 is a wasteful number, since it uses less digits than its factorization.

617420388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961 (or 959 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 617420388 is about 24847.9453476540. The cubic root of 617420388 is about 851.5176522124.

It can be divided in two parts, 6174 and 20388, that added together give a palindrome (26562).

The spelling of 617420388 in words is "six hundred seventeen million, four hundred twenty thousand, three hundred eighty-eight".