55693781 has 12 divisors (see below), whose sum is σ = 65792160. Its totient is φ = 46734480.

The previous prime is 55693753. The next prime is 55693789. The reversal of 55693781 is 18739655.

It is not a de Polignac number, because 55693781 - 2¹⁰ = 55692757 is a prime.

It is a super-2 number, since 2×55693781² = 6203594484151922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55693789) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13121 + ... + 16838.

It is an arithmetic number, because the mean of its divisors is an integer number (5482680).

Almost surely, 2^55693781 is an apocalyptic number.

It is an amenable number.

55693781 is a deficient number, since it is larger than the sum of its proper divisors (10098379).

55693781 is a wasteful number, since it uses less digits than its factorization.

55693781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29996 (or 29983 counting only the distinct ones).

The product of its digits is 226800, while the sum is 44.

The square root of 55693781 is about 7462.8266092681. The cubic root of 55693781 is about 381.8876093618.

The spelling of 55693781 in words is "fifty-five million, six hundred ninety-three thousand, seven hundred eighty-one".