28620477 has 24 divisors (see below), whose sum is σ = 43594200. Its totient is φ = 18066048.

The previous prime is 28620463. The next prime is 28620491. The reversal of 28620477 is 77402682.

28620477 is a `hidden beast` number, since 28 + 620 + 4 + 7 + 7 = 666.

It is an interprime number because it is at equal distance from previous prime (28620463) and next prime (28620491).

It can be written as a sum of positive squares in 4 ways, for example, as 3006756 + 25613721 = 1734^2 + 5061^2 .

It is not a de Polignac number, because 28620477 - 2⁴ = 28620461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28620077) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12799 + ... + 14867.

It is an arithmetic number, because the mean of its divisors is an integer number (1816425).

Almost surely, 2^28620477 is an apocalyptic number.

It is an amenable number.

28620477 is a deficient number, since it is larger than the sum of its proper divisors (14973723).

28620477 is a wasteful number, since it uses less digits than its factorization.

28620477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2157 (or 2154 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The square root of 28620477 is about 5349.8109312386. The cubic root of 28620477 is about 305.8855460719.

The spelling of 28620477 in words is "twenty-eight million, six hundred twenty thousand, four hundred seventy-seven".