28513977 has 8 divisors (see below), whose sum is σ = 38212416. Its totient is φ = 18912432.

The previous prime is 28513973. The next prime is 28513993. The reversal of 28513977 is 77931582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28513977 - 2² = 28513973 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28513973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23533 + ... + 24714.

It is an arithmetic number, because the mean of its divisors is an integer number (4776552).

Almost surely, 2^28513977 is an apocalyptic number.

It is an amenable number.

28513977 is a deficient number, since it is larger than the sum of its proper divisors (9698439).

28513977 is a wasteful number, since it uses less digits than its factorization.

28513977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48447.

The product of its digits is 105840, while the sum is 42.

The square root of 28513977 is about 5339.8480315455. The cubic root of 28513977 is about 305.5056630285.

The spelling of 28513977 in words is "twenty-eight million, five hundred thirteen thousand, nine hundred seventy-seven".