28415977 has 2 divisors, whose sum is σ = 28415978. Its totient is φ = 28415976.

The previous prime is 28415957. The next prime is 28415983. The reversal of 28415977 is 77951482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25190361 + 3225616 = 5019^2 + 1796^2 .

It is a cyclic number.

It is not a de Polignac number, because 28415977 - 2¹¹ = 28413929 is a prime.

It is not a weakly prime, because it can be changed into another prime (28415957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14207988 + 14207989.

It is an arithmetic number, because the mean of its divisors is an integer number (14207989).

Almost surely, 2^28415977 is an apocalyptic number.

It is an amenable number.

28415977 is a deficient number, since it is larger than the sum of its proper divisors (1).

28415977 is an equidigital number, since it uses as much as digits as its factorization.

28415977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 43.

The square root of 28415977 is about 5330.6638423371. The cubic root of 28415977 is about 305.1552627029.

It can be divided in two parts, 28415 and 977, that added together give a palindrome (29392).

The spelling of 28415977 in words is "twenty-eight million, four hundred fifteen thousand, nine hundred seventy-seven".