28767291 has 8 divisors (see below), whose sum is σ = 43835904. Its totient is φ = 16438440.

The previous prime is 28767259. The next prime is 28767307. The reversal of 28767291 is 19276782.

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

It is not a de Polignac number, because 28767291 - 2⁵ = 28767259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28767251) 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, 684915 + ... + 684956.

It is an arithmetic number, because the mean of its divisors is an integer number (5479488).

Almost surely, 2^28767291 is an apocalyptic number.

28767291 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28767291 is a deficient number, since it is larger than the sum of its proper divisors (15068613).

28767291 is a wasteful number, since it uses less digits than its factorization.

28767291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1369881.

The product of its digits is 84672, while the sum is 42.

The square root of 28767291 is about 5363.5147990846. The cubic root of 28767291 is about 306.4076863356.

The spelling of 28767291 in words is "twenty-eight million, seven hundred sixty-seven thousand, two hundred ninety-one".