55478761 has 8 divisors (see below), whose sum is σ = 60588864. Its totient is φ = 50489040.

The previous prime is 55478749. The next prime is 55478767. The reversal of 55478761 is 16787455.

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 55478761 - 2⁹ = 55478249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55478767) 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, 29131 + ... + 30976.

It is an arithmetic number, because the mean of its divisors is an integer number (7573608).

Almost surely, 2^55478761 is an apocalyptic number.

It is an amenable number.

55478761 is a deficient number, since it is larger than the sum of its proper divisors (5110103).

55478761 is a wasteful number, since it uses less digits than its factorization.

55478761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60191.

The product of its digits is 235200, while the sum is 43.

The square root of 55478761 is about 7448.4066081277. The cubic root of 55478761 is about 381.3955174691.

The spelling of 55478761 in words is "fifty-five million, four hundred seventy-eight thousand, seven hundred sixty-one".