55782905 has 8 divisors (see below), whose sum is σ = 66989832. Its totient is φ = 44592768.

The previous prime is 55782893. The next prime is 55782931. The reversal of 55782905 is 50928755.

It can be written as a sum of positive squares in 4 ways, for example, as 17007376 + 38775529 = 4124^2 + 6227^2 .

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 55782905 - 2¹⁶ = 55717369 is a prime.

It is a super-2 number, since 2×55782905² = 6223464980478050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4919 + ... + 11651.

It is an arithmetic number, because the mean of its divisors is an integer number (8373729).

Almost surely, 2^55782905 is an apocalyptic number.

It is an amenable number.

55782905 is a deficient number, since it is larger than the sum of its proper divisors (11206927).

55782905 is a wasteful number, since it uses less digits than its factorization.

55782905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8395.

The product of its (nonzero) digits is 126000, while the sum is 41.

The square root of 55782905 is about 7468.7954182719. The cubic root of 55782905 is about 382.0912060757.

The spelling of 55782905 in words is "fifty-five million, seven hundred eighty-two thousand, nine hundred five".