55858781 has 8 divisors (see below), whose sum is σ = 61970400. Its totient is φ = 49919440.

The previous prime is 55858741. The next prime is 55858783. The reversal of 55858781 is 18785855.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55858781 is a prime.

It is a super-2 number, since 2×55858781² = 6240406829611922, 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 (55858783) 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, 42386 + ... + 43683.

It is an arithmetic number, because the mean of its divisors is an integer number (7746300).

Almost surely, 2^55858781 is an apocalyptic number.

It is an amenable number.

55858781 is a deficient number, since it is larger than the sum of its proper divisors (6111619).

55858781 is a wasteful number, since it uses less digits than its factorization.

55858781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86139.

The product of its digits is 448000, while the sum is 47.

The square root of 55858781 is about 7473.8732261124. The cubic root of 55858781 is about 382.2643679521.

The spelling of 55858781 in words is "fifty-five million, eight hundred fifty-eight thousand, seven hundred eighty-one".