55826781 has 8 divisors (see below), whose sum is σ = 74497344. Its totient is φ = 37187040.

The previous prime is 55826779. The next prime is 55826783. The reversal of 55826781 is 18762855.

It is an interprime number because it is at equal distance from previous prime (55826779) and next prime (55826783).

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

It is not a de Polignac number, because 55826781 - 2¹ = 55826779 is a prime.

It is a super-2 number, since 2×55826781² = 6233258953643922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55826783) 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, 3081 + ... + 11006.

It is an arithmetic number, because the mean of its divisors is an integer number (9312168).

Almost surely, 2^55826781 is an apocalyptic number.

It is an amenable number.

55826781 is a deficient number, since it is larger than the sum of its proper divisors (18670563).

55826781 is a wasteful number, since it uses less digits than its factorization.

55826781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15411.

The product of its digits is 134400, while the sum is 42.

The square root of 55826781 is about 7471.7321284960. The cubic root of 55826781 is about 382.1913576680.

The spelling of 55826781 in words is "fifty-five million, eight hundred twenty-six thousand, seven hundred eighty-one".