28377987 has 8 divisors (see below), whose sum is σ = 41277120. Its totient is φ = 17198760.

The previous prime is 28377983. The next prime is 28378003. The reversal of 28377987 is 78977382.

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

It is not a de Polignac number, because 28377987 - 2² = 28377983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28377983) 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, 429937 + ... + 430002.

It is an arithmetic number, because the mean of its divisors is an integer number (5159640).

Almost surely, 2^28377987 is an apocalyptic number.

28377987 is a deficient number, since it is larger than the sum of its proper divisors (12899133).

28377987 is a wasteful number, since it uses less digits than its factorization.

28377987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 859953.

The product of its digits is 1185408, while the sum is 51.

The square root of 28377987 is about 5327.0993044996. The cubic root of 28377987 is about 305.0192122629.

It can be divided in two parts, 28 and 377987, that added together give a triangular number (378015 = T₈₆₉).

The spelling of 28377987 in words is "twenty-eight million, three hundred seventy-seven thousand, nine hundred eighty-seven".