28400757 has 24 divisors (see below), whose sum is σ = 47573568. Its totient is φ = 14752320.

The previous prime is 28400753. The next prime is 28400759. The reversal of 28400757 is 75700482.

It is not a de Polignac number, because 28400757 - 2² = 28400753 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28400753) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3048 + ... + 8129.

It is an arithmetic number, because the mean of its divisors is an integer number (1982232).

Almost surely, 2^28400757 is an apocalyptic number.

It is an amenable number.

28400757 is a deficient number, since it is larger than the sum of its proper divisors (19172811).

28400757 is a wasteful number, since it uses less digits than its factorization.

28400757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11209 (or 11198 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 33.

The square root of 28400757 is about 5329.2360615758. The cubic root of 28400757 is about 305.1007711451.

The spelling of 28400757 in words is "twenty-eight million, four hundred thousand, seven hundred fifty-seven".