228992557 has 8 divisors (see below), whose sum is σ = 232343552. Its totient is φ = 225666000.

The previous prime is 228992549. The next prime is 228992581. The reversal of 228992557 is 755299822.

228992557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 228992557 - 2³ = 228992549 is a prime.

It is a super-2 number, since 2×228992557² = 104875182322796498, which contains 22 as substring.

It is the 15133-rd Hogben number.

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 228992557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228990557) by changing a digit.

It is a nontrivial repunit in base 15132.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13207 + ... + 25147.

It is an arithmetic number, because the mean of its divisors is an integer number (29042944).

Almost surely, 2^228992557 is an apocalyptic number.

It is an amenable number.

228992557 is a deficient number, since it is larger than the sum of its proper divisors (3350995).

228992557 is a wasteful number, since it uses less digits than its factorization.

228992557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12219.

The product of its digits is 907200, while the sum is 49.

The square root of 228992557 is about 15132.5000247811. The cubic root of 228992557 is about 611.7966888773.

The spelling of 228992557 in words is "two hundred twenty-eight million, nine hundred ninety-two thousand, five hundred fifty-seven".