27961551 has 8 divisors (see below), whose sum is σ = 41424560. Its totient is φ = 18641016.

The previous prime is 27961541. The next prime is 27961553. The reversal of 27961551 is 15516972.

It is not a de Polignac number, because 27961551 - 2⁵ = 27961519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27961553) 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, 517780 + ... + 517833.

It is an arithmetic number, because the mean of its divisors is an integer number (5178070).

Almost surely, 2^27961551 is an apocalyptic number.

27961551 is a deficient number, since it is larger than the sum of its proper divisors (13463009).

27961551 is a wasteful number, since it uses less digits than its factorization.

27961551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1035622 (or 1035616 counting only the distinct ones).

The product of its digits is 18900, while the sum is 36.

The square root of 27961551 is about 5287.8682850464. The cubic root of 27961551 is about 303.5198408882.

The spelling of 27961551 in words is "twenty-seven million, nine hundred sixty-one thousand, five hundred fifty-one".