28000002977 has 4 divisors (see below), whose sum is σ = 28000591920. Its totient is φ = 27999414036.

The previous prime is 28000002929. The next prime is 28000003007. The reversal of 28000002977 is 77920000082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77920000082 = 2 ⋅38960000041.

It is a cyclic number.

It is not a de Polignac number, because 28000002977 - 2⁸ = 28000002721 is a prime.

It is a super-3 number, since 3×28000002977³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28000002907) 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, 216227 + ... + 320552.

It is an arithmetic number, because the mean of its divisors is an integer number (7000147980).

Almost surely, 2^28000002977 is an apocalyptic number.

It is an amenable number.

28000002977 is a deficient number, since it is larger than the sum of its proper divisors (588943).

28000002977 is an equidigital number, since it uses as much as digits as its factorization.

28000002977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588942.

The product of its (nonzero) digits is 14112, while the sum is 35.

The spelling of 28000002977 in words is "twenty-eight billion, two thousand, nine hundred seventy-seven".