28477561 has 16 divisors (see below), whose sum is σ = 35368960. Its totient is φ = 22375440.

The previous prime is 28477541. The next prime is 28477571. The reversal of 28477561 is 16577482.

It is a cyclic number.

It is not a de Polignac number, because 28477561 - 2⁵ = 28477529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28477541) 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, 670 + ... + 7576.

It is an arithmetic number, because the mean of its divisors is an integer number (2210560).

Almost surely, 2^28477561 is an apocalyptic number.

It is an amenable number.

28477561 is a deficient number, since it is larger than the sum of its proper divisors (6891399).

28477561 is a wasteful number, since it uses less digits than its factorization.

28477561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6964.

The product of its digits is 94080, while the sum is 40.

The square root of 28477561 is about 5336.4371072842. The cubic root of 28477561 is about 305.3755510051.

The spelling of 28477561 in words is "twenty-eight million, four hundred seventy-seven thousand, five hundred sixty-one".