28216377 has 32 divisors (see below), whose sum is σ = 49858560. Its totient is φ = 15420240.

The previous prime is 28216369. The next prime is 28216381. The reversal of 28216377 is 77361282.

28216377 is a `hidden beast` number, since 282 + 1 + 6 + 377 = 666.

It is not a de Polignac number, because 28216377 - 2³ = 28216369 is a prime.

It is a super-2 number, since 2×28216377² = 1592327862012258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28216477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1102 + ... + 7592.

It is an arithmetic number, because the mean of its divisors is an integer number (1558080).

Almost surely, 2^28216377 is an apocalyptic number.

28216377 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

28216377 is a deficient number, since it is larger than the sum of its proper divisors (21642183).

28216377 is a wasteful number, since it uses less digits than its factorization.

28216377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6530 (or 6524 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 28216377 is about 5311.9089788889. The cubic root of 28216377 is about 304.4390909257.

The spelling of 28216377 in words is "twenty-eight million, two hundred sixteen thousand, three hundred seventy-seven".