55908781 has 8 divisors (see below), whose sum is σ = 58032000. Its totient is φ = 53798640.

The previous prime is 55908751. The next prime is 55908793. The reversal of 55908781 is 18780955.

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 55908781 - 2¹⁵ = 55876013 is a prime.

It is a super-2 number, since 2×55908781² = 6251583585811922, 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 (55908701) 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, 5920 + ... + 12118.

It is an arithmetic number, because the mean of its divisors is an integer number (7254000).

Almost surely, 2^55908781 is an apocalyptic number.

It is an amenable number.

55908781 is a deficient number, since it is larger than the sum of its proper divisors (2123219).

55908781 is a wasteful number, since it uses less digits than its factorization.

55908781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6539.

The product of its (nonzero) digits is 100800, while the sum is 43.

The square root of 55908781 is about 7477.2174637361. The cubic root of 55908781 is about 382.3783907195.

The spelling of 55908781 in words is "fifty-five million, nine hundred eight thousand, seven hundred eighty-one".