28457957 has 16 divisors (see below), whose sum is σ = 31752000. Its totient is φ = 25290240.

The previous prime is 28457941. The next prime is 28457963. The reversal of 28457957 is 75975482.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28457957 - 2⁴ = 28457941 is a prime.

It is a super-2 number, since 2×28457957² = 1619710633227698, 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 (28457917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158894 + ... + 159072.

It is an arithmetic number, because the mean of its divisors is an integer number (1984500).

Almost surely, 2^28457957 is an apocalyptic number.

It is an amenable number.

28457957 is a deficient number, since it is larger than the sum of its proper divisors (3294043).

28457957 is a wasteful number, since it uses less digits than its factorization.

28457957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436.

The product of its digits is 705600, while the sum is 47.

The square root of 28457957 is about 5334.5999850036. The cubic root of 28457957 is about 305.3054612416.

The spelling of 28457957 in words is "twenty-eight million, four hundred fifty-seven thousand, nine hundred fifty-seven".