28657031 has 8 divisors (see below), whose sum is σ = 30911664. Its totient is φ = 26409600.

The previous prime is 28657009. The next prime is 28657037. The reversal of 28657031 is 13075682.

It is a happy number.

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 28657031 - 2⁶ = 28656967 is a prime.

It is a super-2 number, since 2×28657031² = 1642450851469922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28657037) 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, 8831 + ... + 11631.

It is an arithmetic number, because the mean of its divisors is an integer number (3863958).

Almost surely, 2^28657031 is an apocalyptic number.

28657031 is a deficient number, since it is larger than the sum of its proper divisors (2254633).

28657031 is a wasteful number, since it uses less digits than its factorization.

28657031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3601.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 28657031 is about 5353.2262235030. The cubic root of 28657031 is about 306.0157160823.

The spelling of 28657031 in words is "twenty-eight million, six hundred fifty-seven thousand, thirty-one".