7638436 has 12 divisors (see below), whose sum is σ = 14395612. Its totient is φ = 3525408.

The previous prime is 7638403. The next prime is 7638473. The reversal of 7638436 is 6348367.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1849600 + 5788836 = 1360^2 + 2406^2 .

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 7638395 and 7638404.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 73395 + ... + 73498.

Almost surely, 2^7638436 is an apocalyptic number.

It is an amenable number.

7638436 is a deficient number, since it is larger than the sum of its proper divisors (6757176).

7638436 is a wasteful number, since it uses less digits than its factorization.

7638436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146910 (or 146908 counting only the distinct ones).

The product of its digits is 72576, while the sum is 37.

The square root of 7638436 is about 2763.7720600657. The cubic root of 7638436 is about 196.9403995710.

The spelling of 7638436 in words is "seven million, six hundred thirty-eight thousand, four hundred thirty-six".