28432477 has 2 divisors, whose sum is σ = 28432478. Its totient is φ = 28432476.

The previous prime is 28432471. The next prime is 28432489. The reversal of 28432477 is 77423482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20016676 + 8415801 = 4474^2 + 2901^2 .

It is a cyclic number.

It is not a de Polignac number, because 28432477 - 2¹⁹ = 27908189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28432471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14216238 + 14216239.

It is an arithmetic number, because the mean of its divisors is an integer number (14216239).

Almost surely, 2^28432477 is an apocalyptic number.

It is an amenable number.

28432477 is a deficient number, since it is larger than the sum of its proper divisors (1).

28432477 is an equidigital number, since it uses as much as digits as its factorization.

28432477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75264, while the sum is 37.

The square root of 28432477 is about 5332.2112673824. The cubic root of 28432477 is about 305.2143150170.

It can be divided in two parts, 284 and 32477, that added together give a square (32761 = 181²).

The spelling of 28432477 in words is "twenty-eight million, four hundred thirty-two thousand, four hundred seventy-seven".