28661787 has 48 divisors (see below), whose sum is σ = 52565760. Its totient is φ = 14616000.

The previous prime is 28661783. The next prime is 28661803. The reversal of 28661787 is 78716682.

28661787 is a `hidden beast` number, since 28 + 6 + 617 + 8 + 7 = 666.

It is not a de Polignac number, because 28661787 - 2² = 28661783 is a prime.

Its product of digits (225792) is a multiple of the sum of its prime factors (784).

It is not an unprimeable number, because it can be changed into a prime (28661783) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 40537 + ... + 41237.

It is an arithmetic number, because the mean of its divisors is an integer number (1095120).

Almost surely, 2^28661787 is an apocalyptic number.

28661787 is a deficient number, since it is larger than the sum of its proper divisors (23903973).

28661787 is a wasteful number, since it uses less digits than its factorization.

28661787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784 (or 781 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The square root of 28661787 is about 5353.6704231770. The cubic root of 28661787 is about 306.0326442170.

The spelling of 28661787 in words is "twenty-eight million, six hundred sixty-one thousand, seven hundred eighty-seven".