28642357 has 4 divisors (see below), whose sum is σ = 29566336. Its totient is φ = 27718380.

The previous prime is 28642351. The next prime is 28642373. The reversal of 28642357 is 75324682.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28642357 - 2³ = 28642349 is a prime.

It is a super-2 number, since 2×28642357² = 1640769229030898, 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 (28642351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 461943 + ... + 462004.

It is an arithmetic number, because the mean of its divisors is an integer number (7391584).

Almost surely, 2^28642357 is an apocalyptic number.

It is an amenable number.

28642357 is a deficient number, since it is larger than the sum of its proper divisors (923979).

28642357 is an equidigital number, since it uses as much as digits as its factorization.

28642357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923978.

The product of its digits is 80640, while the sum is 37.

The square root of 28642357 is about 5351.8554726375. The cubic root of 28642357 is about 305.9634747866.

The spelling of 28642357 in words is "twenty-eight million, six hundred forty-two thousand, three hundred fifty-seven".