617871138 has 32 divisors (see below), whose sum is σ = 1264237632. Its totient is φ = 201240000.

The previous prime is 617871131. The next prime is 617871161. The reversal of 617871138 is 831178716.

It is a self number, because there is not a number n which added to its sum of digits gives 617871138.

It is not an unprimeable number, because it can be changed into a prime (617871131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75948 + ... + 83688.

It is an arithmetic number, because the mean of its divisors is an integer number (39507426).

Almost surely, 2^617871138 is an apocalyptic number.

617871138 is an abundant number, since it is smaller than the sum of its proper divisors (646366494).

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

617871138 is a wasteful number, since it uses less digits than its factorization.

617871138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8050.

The product of its digits is 56448, while the sum is 42.

The square root of 617871138 is about 24857.0138592712. The cubic root of 617871138 is about 851.7248196592.

The spelling of 617871138 in words is "six hundred seventeen million, eight hundred seventy-one thousand, one hundred thirty-eight".