137528781 has 8 divisors (see below), whose sum is σ = 197477280. Its totient is φ = 84633072.

The previous prime is 137528779. The next prime is 137528791. The reversal of 137528781 is 187825731.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 137528781 - 2¹ = 137528779 is a prime.

It is a super-2 number, since 2×137528781² = 37828331206691922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137528711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1763151 + ... + 1763228.

It is an arithmetic number, because the mean of its divisors is an integer number (24684660).

Almost surely, 2^137528781 is an apocalyptic number.

It is an amenable number.

137528781 is a deficient number, since it is larger than the sum of its proper divisors (59948499).

137528781 is a wasteful number, since it uses less digits than its factorization.

137528781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3526395.

The product of its digits is 94080, while the sum is 42.

The square root of 137528781 is about 11727.2665613092. The cubic root of 137528781 is about 516.1760674025.

The spelling of 137528781 in words is "one hundred thirty-seven million, five hundred twenty-eight thousand, seven hundred eighty-one".