28940977 has 4 divisors (see below), whose sum is σ = 31167220. Its totient is φ = 26714736.

The previous prime is 28940963. The next prime is 28940983. The reversal of 28940977 is 77904982.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3549456 + 25391521 = 1884^2 + 5039^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28940977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28940077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1113102 + ... + 1113127.

It is an arithmetic number, because the mean of its divisors is an integer number (7791805).

Almost surely, 2^28940977 is an apocalyptic number.

It is an amenable number.

28940977 is a deficient number, since it is larger than the sum of its proper divisors (2226243).

28940977 is a wasteful number, since it uses less digits than its factorization.

28940977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2226242.

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 28940977 is about 5379.6818679175. The cubic root of 28940977 is about 307.0231072592.

The spelling of 28940977 in words is "twenty-eight million, nine hundred forty thousand, nine hundred seventy-seven".