131628638 has 4 divisors (see below), whose sum is σ = 197442960. Its totient is φ = 65814318.

The previous prime is 131628631. The next prime is 131628683. The reversal of 131628638 is 836826131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 836826131 = 1013 ⋅826087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131628631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32907158 + ... + 32907161.

It is an arithmetic number, because the mean of its divisors is an integer number (49360740).

Almost surely, 2^131628638 is an apocalyptic number.

131628638 is a deficient number, since it is larger than the sum of its proper divisors (65814322).

131628638 is an equidigital number, since it uses as much as digits as its factorization.

131628638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65814321.

The product of its digits is 41472, while the sum is 38.

The square root of 131628638 is about 11472.9524534882. The cubic root of 131628638 is about 508.6864029150.

The spelling of 131628638 in words is "one hundred thirty-one million, six hundred twenty-eight thousand, six hundred thirty-eight".