55780208 has 40 divisors (see below), whose sum is σ = 118318320. Its totient is φ = 25264640.

The previous prime is 55780189. The next prime is 55780223. The reversal of 55780208 is 80208755.

It is a super-2 number, since 2×55780208² = 6222863209046528, 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 in 7 ways as a sum of consecutive naturals, for example, 97748 + ... + 98316.

It is an arithmetic number, because the mean of its divisors is an integer number (2957958).

Almost surely, 2^55780208 is an apocalyptic number.

It is an amenable number.

55780208 is an abundant number, since it is smaller than the sum of its proper divisors (62538112).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55780208 is a wasteful number, since it uses less digits than its factorization.

55780208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1145 (or 1139 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 35.

The square root of 55780208 is about 7468.6148648863. The cubic root of 55780208 is about 382.0850481761.

It can be divided in two parts, 557 and 80208, that multiplied together give a square (44675856 = 6684²).

The spelling of 55780208 in words is "fifty-five million, seven hundred eighty thousand, two hundred eight".