28742977 has 2 divisors, whose sum is σ = 28742978. Its totient is φ = 28742976.

The previous prime is 28742951. The next prime is 28743037. The reversal of 28742977 is 77924782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20034576 + 8708401 = 4476^2 + 2951^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28742977 is a prime.

It is not a weakly prime, because it can be changed into another prime (28742677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14371488 + 14371489.

It is an arithmetic number, because the mean of its divisors is an integer number (14371489).

Almost surely, 2^28742977 is an apocalyptic number.

It is an amenable number.

28742977 is a deficient number, since it is larger than the sum of its proper divisors (1).

28742977 is an equidigital number, since it uses as much as digits as its factorization.

28742977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 395136, while the sum is 46.

The square root of 28742977 is about 5361.2477092557. The cubic root of 28742977 is about 306.3213371509.

It can be divided in two parts, 287 and 42977, that added together give a square (43264 = 208²).

The spelling of 28742977 in words is "twenty-eight million, seven hundred forty-two thousand, nine hundred seventy-seven".