7638740 has 12 divisors (see below), whose sum is σ = 16041396. Its totient is φ = 3055488.

The previous prime is 7638733. The next prime is 7638767. The reversal of 7638740 is 478367.

It can be written as a sum of positive squares in 2 ways, for example, as 4477456 + 3161284 = 2116^2 + 1778^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 7638740.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190949 + ... + 190988.

It is an arithmetic number, because the mean of its divisors is an integer number (1336783).

Almost surely, 2^7638740 is an apocalyptic number.

It is an amenable number.

7638740 is an abundant number, since it is smaller than the sum of its proper divisors (8402656).

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

7638740 is a wasteful number, since it uses less digits than its factorization.

7638740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381946 (or 381944 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 7638740 is about 2763.8270568181. The cubic root of 7638740 is about 196.9430121952.

The spelling of 7638740 in words is "seven million, six hundred thirty-eight thousand, seven hundred forty".