228731157 has 12 divisors (see below), whose sum is σ = 334102860. Its totient is φ = 150773568.

The previous prime is 228731137. The next prime is 228731171. The reversal of 228731157 is 751137822.

It can be written as a sum of positive squares in 2 ways, for example, as 16329681 + 212401476 = 4041^2 + 14574^2 .

It is not a de Polignac number, because 228731157 - 2²² = 224536853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228731137) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 141978 + ... + 143579.

It is an arithmetic number, because the mean of its divisors is an integer number (27841905).

Almost surely, 2^228731157 is an apocalyptic number.

It is an amenable number.

228731157 is a deficient number, since it is larger than the sum of its proper divisors (105371703).

228731157 is a wasteful number, since it uses less digits than its factorization.

228731157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285652 (or 285649 counting only the distinct ones).

The product of its digits is 23520, while the sum is 36.

The square root of 228731157 is about 15123.8605190606. The cubic root of 228731157 is about 611.5638071521.

Adding to 228731157 its reverse (751137822), we get a palindrome (979868979).

The spelling of 228731157 in words is "two hundred twenty-eight million, seven hundred thirty-one thousand, one hundred fifty-seven".