157828261 has 4 divisors (see below), whose sum is σ = 157953132. Its totient is φ = 157703392.

The previous prime is 157828217. The next prime is 157828309. The reversal of 157828261 is 162828751.

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

It can be written as a sum of positive squares in 2 ways, for example, as 82919236 + 74909025 = 9106^2 + 8655^2 .

It is a cyclic number.

It is not a de Polignac number, because 157828261 - 2⁷ = 157828133 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157828201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60520 + ... + 63073.

It is an arithmetic number, because the mean of its divisors is an integer number (39488283).

Almost surely, 2^157828261 is an apocalyptic number.

It is an amenable number.

157828261 is a deficient number, since it is larger than the sum of its proper divisors (124871).

157828261 is a wasteful number, since it uses less digits than its factorization.

157828261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124870.

The product of its digits is 53760, while the sum is 40.

The square root of 157828261 is about 12562.9718219854. The cubic root of 157828261 is about 540.4160727928.

The spelling of 157828261 in words is "one hundred fifty-seven million, eight hundred twenty-eight thousand, two hundred sixty-one".