137728641 has 4 divisors (see below), whose sum is σ = 183638192. Its totient is φ = 91819092.

The previous prime is 137728639. The next prime is 137728649. The reversal of 137728641 is 146827731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 146827731 = 3 ⋅48942577.

It is not a de Polignac number, because 137728641 - 2¹ = 137728639 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 137728641.

It is not an unprimeable number, because it can be changed into a prime (137728649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22954771 + ... + 22954776.

It is an arithmetic number, because the mean of its divisors is an integer number (45909548).

Almost surely, 2^137728641 is an apocalyptic number.

It is an amenable number.

137728641 is a deficient number, since it is larger than the sum of its proper divisors (45909551).

137728641 is an equidigital number, since it uses as much as digits as its factorization.

137728641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45909550.

The product of its digits is 56448, while the sum is 39.

The square root of 137728641 is about 11735.7846350383. The cubic root of 137728641 is about 516.4259860388.

The spelling of 137728641 in words is "one hundred thirty-seven million, seven hundred twenty-eight thousand, six hundred forty-one".