55782381 has 8 divisors (see below), whose sum is σ = 74461120. Its totient is φ = 37145952.

The previous prime is 55782371. The next prime is 55782403. The reversal of 55782381 is 18328755.

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

It is not a de Polignac number, because 55782381 - 2¹⁰ = 55781357 is a prime.

It is a super-2 number, since 2×55782381² = 6223348060058322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55782371) 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, 7360 + ... + 12873.

It is an arithmetic number, because the mean of its divisors is an integer number (9307640).

Almost surely, 2^55782381 is an apocalyptic number.

It is an amenable number.

55782381 is a deficient number, since it is larger than the sum of its proper divisors (18678739).

55782381 is a wasteful number, since it uses less digits than its factorization.

55782381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21155.

The product of its digits is 67200, while the sum is 39.

The square root of 55782381 is about 7468.7603389050. The cubic root of 55782381 is about 382.0900096732.

The spelling of 55782381 in words is "fifty-five million, seven hundred eighty-two thousand, three hundred eighty-one".