28771636 has 12 divisors (see below), whose sum is σ = 51040612. Its totient is φ = 14188608.

The previous prime is 28771591. The next prime is 28771651. The reversal of 28771636 is 63617782.

It can be written as a sum of positive squares in 2 ways, for example, as 18974736 + 9796900 = 4356^2 + 3130^2 .

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48975 + ... + 49558.

Almost surely, 2^28771636 is an apocalyptic number.

It is an amenable number.

28771636 is a deficient number, since it is larger than the sum of its proper divisors (22268976).

28771636 is a wasteful number, since it uses less digits than its factorization.

28771636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98610 (or 98608 counting only the distinct ones).

The product of its digits is 84672, while the sum is 40.

The square root of 28771636 is about 5363.9198353443. The cubic root of 28771636 is about 306.4231121233.

The spelling of 28771636 in words is "twenty-eight million, seven hundred seventy-one thousand, six hundred thirty-six".