28697537 has 16 divisors (see below), whose sum is σ = 33730560. Its totient is φ = 24142800.

The previous prime is 28697531. The next prime is 28697563. The reversal of 28697537 is 73579682.

It is not a de Polignac number, because 28697537 - 2⁸ = 28697281 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28697491 and 28697500.

It is not an unprimeable number, because it can be changed into a prime (28697531) 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, 6014 + ... + 9672.

It is an arithmetic number, because the mean of its divisors is an integer number (2108160).

Almost surely, 2^28697537 is an apocalyptic number.

It is an amenable number.

28697537 is a deficient number, since it is larger than the sum of its proper divisors (5033023).

28697537 is a wasteful number, since it uses less digits than its factorization.

28697537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3724.

The product of its digits is 635040, while the sum is 47.

The square root of 28697537 is about 5357.0082135461. The cubic root of 28697537 is about 306.1598300690.

The spelling of 28697537 in words is "twenty-eight million, six hundred ninety-seven thousand, five hundred thirty-seven".