7520638 has 4 divisors (see below), whose sum is σ = 11280960. Its totient is φ = 3760318.

The previous prime is 7520633. The next prime is 7520659. The reversal of 7520638 is 8360257.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8360257 = 491 ⋅17027.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7520633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1880158 + ... + 1880161.

It is an arithmetic number, because the mean of its divisors is an integer number (2820240).

Almost surely, 2^7520638 is an apocalyptic number.

7520638 is a deficient number, since it is larger than the sum of its proper divisors (3760322).

7520638 is a wasteful number, since it uses less digits than its factorization.

7520638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3760321.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 7520638 is about 2742.3781650239. The cubic root of 7520638 is about 195.9227621533.

The spelling of 7520638 in words is "seven million, five hundred twenty thousand, six hundred thirty-eight".