64170040 has 128 divisors (see below), whose sum is σ = 167961600. Its totient is φ = 21844480.

The previous prime is 64169983. The next prime is 64170077. The reversal of 64170040 is 4007146.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 64169993 and 64170020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 599667 + ... + 599773.

It is an arithmetic number, because the mean of its divisors is an integer number (1312200).

Almost surely, 2^64170040 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 64170040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83980800).

64170040 is an abundant number, since it is smaller than the sum of its proper divisors (103791560).

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

64170040 is a wasteful number, since it uses less digits than its factorization.

64170040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205 (or 201 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 64170040 is about 8010.6204503771. The cubic root of 64170040 is about 400.3539367296.

Adding to 64170040 its reverse (4007146), we get a palindrome (68177186).

The spelling of 64170040 in words is "sixty-four million, one hundred seventy thousand, forty".