55778238 has 24 divisors (see below), whose sum is σ = 124752576. Its totient is φ = 17992800.

The previous prime is 55778231. The next prime is 55778263. The reversal of 55778238 is 83287755.

55778238 is a `hidden beast` number, since 557 + 78 + 23 + 8 = 666.

It is a super-2 number, since 2×55778238² = 6222423668769288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55778193 and 55778202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55778231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49423 + ... + 50538.

It is an arithmetic number, because the mean of its divisors is an integer number (5198024).

Almost surely, 2^55778238 is an apocalyptic number.

55778238 is an abundant number, since it is smaller than the sum of its proper divisors (68974338).

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

55778238 is a wasteful number, since it uses less digits than its factorization.

55778238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100000 (or 99997 counting only the distinct ones).

The product of its digits is 470400, while the sum is 45.

The square root of 55778238 is about 7468.4829784903. The cubic root of 55778238 is about 382.0805500669.

The spelling of 55778238 in words is "fifty-five million, seven hundred seventy-eight thousand, two hundred thirty-eight".