28997651 has 8 divisors (see below), whose sum is σ = 30057600. Its totient is φ = 27941760.

The previous prime is 28997623. The next prime is 28997653. The reversal of 28997651 is 15679982.

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

It is a cyclic number.

It is not a de Polignac number, because 28997651 - 2²² = 24803347 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28997596 and 28997605.

It is not an unprimeable number, because it can be changed into a prime (28997653) 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 7 ways as a sum of consecutive naturals, for example, 28235 + ... + 29243.

It is an arithmetic number, because the mean of its divisors is an integer number (3757200).

Almost surely, 2^28997651 is an apocalyptic number.

28997651 is a deficient number, since it is larger than the sum of its proper divisors (1059949).

28997651 is a wasteful number, since it uses less digits than its factorization.

28997651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2029.

The product of its digits is 272160, while the sum is 47.

The square root of 28997651 is about 5384.9467035431. The cubic root of 28997651 is about 307.2233870892.

The spelling of 28997651 in words is "twenty-eight million, nine hundred ninety-seven thousand, six hundred fifty-one".