55478398 has 4 divisors (see below), whose sum is σ = 83217600. Its totient is φ = 27739198.

The previous prime is 55478393. The next prime is 55478407. The reversal of 55478398 is 89387455.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89387455 = 5 ⋅17877491.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55478393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13869598 + ... + 13869601.

It is an arithmetic number, because the mean of its divisors is an integer number (20804400).

Almost surely, 2^55478398 is an apocalyptic number.

55478398 is a deficient number, since it is larger than the sum of its proper divisors (27739202).

55478398 is a wasteful number, since it uses less digits than its factorization.

55478398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27739201.

The product of its digits is 1209600, while the sum is 49.

The square root of 55478398 is about 7448.3822404600. The cubic root of 55478398 is about 381.3946856380.

The spelling of 55478398 in words is "fifty-five million, four hundred seventy-eight thousand, three hundred ninety-eight".