28077831 has 6 divisors (see below), whose sum is σ = 40556880. Its totient is φ = 18718548.

The previous prime is 28077823. The next prime is 28077851. The reversal of 28077831 is 13877082.

It is not a de Polignac number, because 28077831 - 2³ = 28077823 is a prime.

It is a super-2 number, since 2×28077831² = 1576729187329122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28077811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1559871 + ... + 1559888.

It is an arithmetic number, because the mean of its divisors is an integer number (6759480).

Almost surely, 2^28077831 is an apocalyptic number.

28077831 is a deficient number, since it is larger than the sum of its proper divisors (12479049).

28077831 is a wasteful number, since it uses less digits than its factorization.

28077831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3119765 (or 3119762 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 28077831 is about 5298.8518567705. The cubic root of 28077831 is about 303.9399949376.

The spelling of 28077831 in words is "twenty-eight million, seventy-seven thousand, eight hundred thirty-one".