55785247 has 4 divisors (see below), whose sum is σ = 63754576. Its totient is φ = 47815920.

The previous prime is 55785239. The next prime is 55785253. The reversal of 55785247 is 74258755.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74258755 = 5 ⋅14851751.

It is a cyclic number.

It is not a de Polignac number, because 55785247 - 2³ = 55785239 is a prime.

It is a super-2 number, since 2×55785247² = 6223987565702018, 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 (55785217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3984654 + ... + 3984667.

It is an arithmetic number, because the mean of its divisors is an integer number (15938644).

Almost surely, 2^55785247 is an apocalyptic number.

55785247 is a deficient number, since it is larger than the sum of its proper divisors (7969329).

55785247 is an equidigital number, since it uses as much as digits as its factorization.

55785247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7969328.

The product of its digits is 392000, while the sum is 43.

The square root of 55785247 is about 7468.9522022838. The cubic root of 55785247 is about 382.0965532640.

The spelling of 55785247 in words is "fifty-five million, seven hundred eighty-five thousand, two hundred forty-seven".