55478474 has 4 divisors (see below), whose sum is σ = 83217714. Its totient is φ = 27739236.

The previous prime is 55478419. The next prime is 55478509. The reversal of 55478474 is 47487455.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 47487455 = 5 ⋅9497491.

It can be written as a sum of positive squares in only one way, i.e., 54390625 + 1087849 = 7375^2 + 1043^2 .

It is a super-2 number, since 2×55478474² = 6155722154737352, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13869617 + ... + 13869620.

Almost surely, 2^55478474 is an apocalyptic number.

55478474 is a deficient number, since it is larger than the sum of its proper divisors (27739240).

55478474 is a wasteful number, since it uses less digits than its factorization.

55478474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27739239.

The product of its digits is 627200, while the sum is 44.

The square root of 55478474 is about 7448.3873422372. The cubic root of 55478474 is about 381.3948597958.

The spelling of 55478474 in words is "fifty-five million, four hundred seventy-eight thousand, four hundred seventy-four".