55490643 has 24 divisors (see below), whose sum is σ = 89025840. Its totient is φ = 34145280.

The previous prime is 55490609. The next prime is 55490681. The reversal of 55490643 is 34609455.

It is a happy number.

55490643 is a `hidden beast` number, since 5 + 5 + 4 + 9 + 0 + 643 = 666.

It is not a de Polignac number, because 55490643 - 2⁹ = 55490131 is a prime.

It is a super-2 number, since 2×55490643² = 6158422921106898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55490598 and 55490607.

It is not an unprimeable number, because it can be changed into a prime (55490443) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1518 + ... + 10643.

It is an arithmetic number, because the mean of its divisors is an integer number (3709410).

Almost surely, 2^55490643 is an apocalyptic number.

55490643 is a deficient number, since it is larger than the sum of its proper divisors (33535197).

55490643 is a wasteful number, since it uses less digits than its factorization.

55490643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12196 (or 12177 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 55490643 is about 7449.2041856832. The cubic root of 55490643 is about 381.4227436121.

The spelling of 55490643 in words is "fifty-five million, four hundred ninety thousand, six hundred forty-three".