28720677 has 8 divisors (see below), whose sum is σ = 38334880. Its totient is φ = 19126800.

The previous prime is 28720673. The next prime is 28720709. The reversal of 28720677 is 77602782.

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

It is not a de Polignac number, because 28720677 - 2² = 28720673 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28720673) 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, 1402 + ... + 7707.

It is an arithmetic number, because the mean of its divisors is an integer number (4791860).

Almost surely, 2^28720677 is an apocalyptic number.

It is an amenable number.

28720677 is a deficient number, since it is larger than the sum of its proper divisors (9614203).

28720677 is a wasteful number, since it uses less digits than its factorization.

28720677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10163.

The product of its (nonzero) digits is 65856, while the sum is 39.

The square root of 28720677 is about 5359.1675659565. The cubic root of 28720677 is about 306.2420976997.

The spelling of 28720677 in words is "twenty-eight million, seven hundred twenty thousand, six hundred seventy-seven".