28487931 has 8 divisors (see below), whose sum is σ = 38551104. Its totient is φ = 18708360.

The previous prime is 28487929. The next prime is 28487941. The reversal of 28487931 is 13978482.

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

It is not a de Polignac number, because 28487931 - 2¹ = 28487929 is a prime.

It is a super-2 number, since 2×28487931² = 1623124425321522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28487941) 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, 70665 + ... + 71066.

It is an arithmetic number, because the mean of its divisors is an integer number (4818888).

Almost surely, 2^28487931 is an apocalyptic number.

28487931 is a deficient number, since it is larger than the sum of its proper divisors (10063173).

28487931 is a wasteful number, since it uses less digits than its factorization.

28487931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141801.

The product of its digits is 96768, while the sum is 42.

The square root of 28487931 is about 5337.4086409043. The cubic root of 28487931 is about 305.4126136379.

The spelling of 28487931 in words is "twenty-eight million, four hundred eighty-seven thousand, nine hundred thirty-one".