27620987 has 4 divisors (see below), whose sum is σ = 27636840. Its totient is φ = 27605136.

The previous prime is 27620977. The next prime is 27621019. The reversal of 27620987 is 78902672.

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 27620987 - 2¹⁸ = 27358843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27620947) 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, 4937 + ... + 8922.

It is an arithmetic number, because the mean of its divisors is an integer number (6909210).

Almost surely, 2^27620987 is an apocalyptic number.

27620987 is a deficient number, since it is larger than the sum of its proper divisors (15853).

27620987 is a wasteful number, since it uses less digits than its factorization.

27620987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15852.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 27620987 is about 5255.5672386527. The cubic root of 27620987 is about 302.2825411602.

Adding to 27620987 its sum of digits (41), we get a triangular number (27621028 = T₇₄₃₂).

The spelling of 27620987 in words is "twenty-seven million, six hundred twenty thousand, nine hundred eighty-seven".