55787281 has 8 divisors (see below), whose sum is σ = 61248384. Its totient is φ = 50391120.

The previous prime is 55787279. The next prime is 55787357. The reversal of 55787281 is 18278755.

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

It is a cyclic number.

It is not a de Polignac number, because 55787281 - 2¹ = 55787279 is a prime.

It is a super-2 number, since 2×55787281² = 6224441442745922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55787201) 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, 14425 + ... + 17878.

It is an arithmetic number, because the mean of its divisors is an integer number (7656048).

Almost surely, 2^55787281 is an apocalyptic number.

It is an amenable number.

55787281 is a deficient number, since it is larger than the sum of its proper divisors (5461103).

55787281 is a wasteful number, since it uses less digits than its factorization.

55787281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32471.

The product of its digits is 156800, while the sum is 43.

The square root of 55787281 is about 7469.0883647203. The cubic root of 55787281 is about 382.1011971139.

The spelling of 55787281 in words is "fifty-five million, seven hundred eighty-seven thousand, two hundred eighty-one".