36638642 has 4 divisors (see below), whose sum is σ = 54957966. Its totient is φ = 18319320.

The previous prime is 36638639. The next prime is 36638681. The reversal of 36638642 is 24683663.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24683663 = 331 ⋅74573.

It can be written as a sum of positive squares in only one way, i.e., 30591961 + 6046681 = 5531^2 + 2459^2 .

It is a junction number, because it is equal to n+sod(n) for n = 36638596 and 36638605.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9159659 + ... + 9159662.

Almost surely, 2^36638642 is an apocalyptic number.

36638642 is a deficient number, since it is larger than the sum of its proper divisors (18319324).

36638642 is a wasteful number, since it uses less digits than its factorization.

36638642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18319323.

The product of its digits is 124416, while the sum is 38.

The square root of 36638642 is about 6052.9862051718. The cubic root of 36638642 is about 332.1338370255.

The spelling of 36638642 in words is "thirty-six million, six hundred thirty-eight thousand, six hundred forty-two".