28730377 has 4 divisors (see below), whose sum is σ = 30940420. Its totient is φ = 26520336.

The previous prime is 28730371. The next prime is 28730417. The reversal of 28730377 is 77303782.

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 8874441 + 19855936 = 2979^2 + 4456^2 .

It is a cyclic number.

It is not a de Polignac number, because 28730377 - 2³ = 28730369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28730371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1105002 + ... + 1105027.

It is an arithmetic number, because the mean of its divisors is an integer number (7735105).

Almost surely, 2^28730377 is an apocalyptic number.

It is an amenable number.

28730377 is a deficient number, since it is larger than the sum of its proper divisors (2210043).

28730377 is a wasteful number, since it uses less digits than its factorization.

28730377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2210042.

The product of its (nonzero) digits is 49392, while the sum is 37.

The square root of 28730377 is about 5360.0724808532. The cubic root of 28730377 is about 306.2765701229.

The spelling of 28730377 in words is "twenty-eight million, seven hundred thirty thousand, three hundred seventy-seven".