28130531 has 8 divisors (see below), whose sum is σ = 33048624. Its totient is φ = 23605920.

The previous prime is 28130527. The next prime is 28130533. The reversal of 28130531 is 13503182.

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

It is not a de Polignac number, because 28130531 - 2² = 28130527 is a prime.

It is a super-2 number, since 2×28130531² = 1582653548683922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28130497 and 28130506.

It is not an unprimeable number, because it can be changed into a prime (28130533) 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, 98216 + ... + 98501.

It is an arithmetic number, because the mean of its divisors is an integer number (4131078).

Almost surely, 2^28130531 is an apocalyptic number.

28130531 is a deficient number, since it is larger than the sum of its proper divisors (4918093).

28130531 is a wasteful number, since it uses less digits than its factorization.

28130531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196741.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 28130531 is about 5303.8223009449. The cubic root of 28130531 is about 304.1300336775.

The spelling of 28130531 in words is "twenty-eight million, one hundred thirty thousand, five hundred thirty-one".