28261437 has 8 divisors (see below), whose sum is σ = 37979136. Its totient is φ = 18692352.

The previous prime is 28261433. The next prime is 28261447. The reversal of 28261437 is 73416282.

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

It is not a de Polignac number, because 28261437 - 2² = 28261433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28261398 and 28261407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28261433) 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, 36708 + ... + 37469.

It is an arithmetic number, because the mean of its divisors is an integer number (4747392).

Almost surely, 2^28261437 is an apocalyptic number.

It is an amenable number.

28261437 is a deficient number, since it is larger than the sum of its proper divisors (9717699).

28261437 is a wasteful number, since it uses less digits than its factorization.

28261437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74307.

The product of its digits is 16128, while the sum is 33.

The square root of 28261437 is about 5316.1486999519. The cubic root of 28261437 is about 304.6010622234.

The spelling of 28261437 in words is "twenty-eight million, two hundred sixty-one thousand, four hundred thirty-seven".