28377131 has 4 divisors (see below), whose sum is σ = 30046392. Its totient is φ = 26707872.

The previous prime is 28377103. The next prime is 28377133. The reversal of 28377131 is 13177382.

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

It is a cyclic number.

It is not a de Polignac number, because 28377131 - 2¹⁴ = 28360747 is a prime.

It is a super-2 number, since 2×28377131² = 1610523127582322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28377133) 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, 834605 + ... + 834638.

It is an arithmetic number, because the mean of its divisors is an integer number (7511598).

Almost surely, 2^28377131 is an apocalyptic number.

28377131 is a deficient number, since it is larger than the sum of its proper divisors (1669261).

28377131 is a wasteful number, since it uses less digits than its factorization.

28377131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1669260.

The product of its digits is 7056, while the sum is 32.

The square root of 28377131 is about 5327.0189599813. The cubic root of 28377131 is about 305.0161453426.

The spelling of 28377131 in words is "twenty-eight million, three hundred seventy-seven thousand, one hundred thirty-one".