28977929 has 2 divisors, whose sum is σ = 28977930. Its totient is φ = 28977928.

The previous prime is 28977899. The next prime is 28977937. The reversal of 28977929 is 92977982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20912329 + 8065600 = 4573^2 + 2840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28977929 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28977029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14488964 + 14488965.

It is an arithmetic number, because the mean of its divisors is an integer number (14488965).

Almost surely, 2^28977929 is an apocalyptic number.

It is an amenable number.

28977929 is a deficient number, since it is larger than the sum of its proper divisors (1).

28977929 is an equidigital number, since it uses as much as digits as its factorization.

28977929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 53.

The square root of 28977929 is about 5383.1151761782. The cubic root of 28977929 is about 307.1537212877.

Adding to 28977929 its sum of digits (53), we get a palindrome (28977982).

The spelling of 28977929 in words is "twenty-eight million, nine hundred seventy-seven thousand, nine hundred twenty-nine".