1640031870 has 64 divisors (see below), whose sum is σ = 4008787200. Its totient is φ = 429320448.

The previous prime is 1640031851. The next prime is 1640031881. The reversal of 1640031870 is 781300461.

It is a happy number.

1640031870 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 495481 + ... + 498779.

It is an arithmetic number, because the mean of its divisors is an integer number (62637300).

Almost surely, 2^1640031870 is an apocalyptic number.

1640031870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1640031870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2004393600).

1640031870 is an abundant number, since it is smaller than the sum of its proper divisors (2368755330).

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

1640031870 is a wasteful number, since it uses less digits than its factorization.

1640031870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3609.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 1640031870 is about 40497.3069474996. The cubic root of 1640031870 is about 1179.2813468578.

The spelling of 1640031870 in words is "one billion, six hundred forty million, thirty-one thousand, eight hundred seventy".