55780798 has 4 divisors (see below), whose sum is σ = 83671200. Its totient is φ = 27890398.

The previous prime is 55780771. The next prime is 55780799. The reversal of 55780798 is 89708755.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89708755 = 5 ⋅17941751.

It is a super-2 number, since 2×55780798² = 6222994851033608, which contains 22 as substring.

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 (55780799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13945198 + ... + 13945201.

It is an arithmetic number, because the mean of its divisors is an integer number (20917800).

Almost surely, 2^55780798 is an apocalyptic number.

55780798 is a deficient number, since it is larger than the sum of its proper divisors (27890402).

55780798 is a wasteful number, since it uses less digits than its factorization.

55780798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27890401.

The product of its (nonzero) digits is 705600, while the sum is 49.

The square root of 55780798 is about 7468.6543634044. The cubic root of 55780798 is about 382.0863953050.

The spelling of 55780798 in words is "fifty-five million, seven hundred eighty thousand, seven hundred ninety-eight".