55775998 has 4 divisors (see below), whose sum is σ = 83664000. Its totient is φ = 27887998.

The previous prime is 55775969. The next prime is 55776013. The reversal of 55775998 is 89957755.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89957755 = 5 ⋅17991551.

It is a super-2 number, since 2×55775998² = 6221923905792008, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13943998 + ... + 13944001.

It is an arithmetic number, because the mean of its divisors is an integer number (20916000).

Almost surely, 2^55775998 is an apocalyptic number.

55775998 is a deficient number, since it is larger than the sum of its proper divisors (27888002).

55775998 is a wasteful number, since it uses less digits than its factorization.

55775998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27888001.

The product of its digits is 3969000, while the sum is 55.

The square root of 55775998 is about 7468.3330134642. Note that the first 3 decimals coincide. The cubic root of 55775998 is about 382.0754353368.

The spelling of 55775998 in words is "fifty-five million, seven hundred seventy-five thousand, nine hundred ninety-eight".