28697040 has 60 divisors (see below), whose sum is σ = 96376644. Its totient is φ = 7652352.

The previous prime is 28697033. The next prime is 28697051. The reversal of 28697040 is 4079682.

It can be written as a sum of positive squares in 2 ways, for example, as 21013056 + 7683984 = 4584^2 + 2772^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28696986 and 28697004.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 19209 + ... + 20648.

Almost surely, 2^28697040 is an apocalyptic number.

28697040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28697040 is an abundant number, since it is smaller than the sum of its proper divisors (67679604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28697040 is a wasteful number, since it uses less digits than its factorization.

28697040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39876 (or 39867 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 28697040 is about 5356.9618255127. The cubic root of 28697040 is about 306.1580626430.

The spelling of 28697040 in words is "twenty-eight million, six hundred ninety-seven thousand, forty".