3640260720 has 80 divisors (see below), whose sum is σ = 11360656800. Its totient is φ = 964211712.

The previous prime is 3640260709. The next prime is 3640260733. The reversal of 3640260720 is 270620463.

It is a tau number, because it is divible by the number of its divisors (80).

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 15 ways as a sum of consecutive naturals, for example, 15139 + ... + 86658.

It is an arithmetic number, because the mean of its divisors is an integer number (142008210).

Almost surely, 2^3640260720 is an apocalyptic number.

3640260720 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3640260720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5680328400).

3640260720 is an abundant number, since it is smaller than the sum of its proper divisors (7720396080).

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

3640260720 is a wasteful number, since it uses less digits than its factorization.

3640260720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101962 (or 101956 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 30.

The square root of 3640260720 is about 60334.5731732644. The cubic root of 3640260720 is about 1538.3110623235.

The spelling of 3640260720 in words is "three billion, six hundred forty million, two hundred sixty thousand, seven hundred twenty".