28201761 has 24 divisors (see below), whose sum is σ = 46775040. Its totient is φ = 16039296.

The previous prime is 28201721. The next prime is 28201781. The reversal of 28201761 is 16710282.

It is not a de Polignac number, because 28201761 - 2¹¹ = 28199713 is a prime.

It is a super-2 number, since 2×28201761² = 1590678647002242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28201721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14121 + ... + 15993.

It is an arithmetic number, because the mean of its divisors is an integer number (1948960).

Almost surely, 2^28201761 is an apocalyptic number.

28201761 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28201761 is a deficient number, since it is larger than the sum of its proper divisors (18573279).

28201761 is a wasteful number, since it uses less digits than its factorization.

28201761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2125 (or 2122 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 28201761 is about 5310.5330240947. The cubic root of 28201761 is about 304.3865156632.

The spelling of 28201761 in words is "twenty-eight million, two hundred one thousand, seven hundred sixty-one".