7139664 has 100 divisors (see below), whose sum is σ = 23646304. Its totient is φ = 2037312.

The previous prime is 7139663. The next prime is 7139701. The reversal of 7139664 is 4669317.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7139663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 8679 + ... + 9465.

Almost surely, 2^7139664 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 7139664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11823152).

7139664 is an abundant number, since it is smaller than the sum of its proper divisors (16506640).

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

7139664 is a wasteful number, since it uses less digits than its factorization.

7139664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814 (or 799 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 7139664 is about 2672.0149700179. The cubic root of 7139664 is about 192.5569764441.

The spelling of 7139664 in words is "seven million, one hundred thirty-nine thousand, six hundred sixty-four".