662728138 has 4 divisors (see below), whose sum is σ = 994092210. Its totient is φ = 331364068.

The previous prime is 662728133. The next prime is 662728139. The reversal of 662728138 is 831827266.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 657768609 + 4959529 = 25647^2 + 2227^2 .

It is a junction number, because it is equal to n+sod(n) for n = 662728094 and 662728103.

It is not an unprimeable number, because it can be changed into a prime (662728133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165682033 + ... + 165682036.

Almost surely, 2^662728138 is an apocalyptic number.

662728138 is a deficient number, since it is larger than the sum of its proper divisors (331364072).

662728138 is a wasteful number, since it uses less digits than its factorization.

662728138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331364071.

The product of its digits is 193536, while the sum is 43.

The square root of 662728138 is about 25743.5067152865. The cubic root of 662728138 is about 871.8567549751.

The spelling of 662728138 in words is "six hundred sixty-two million, seven hundred twenty-eight thousand, one hundred thirty-eight".