551878438 has 4 divisors (see below), whose sum is σ = 827817660. Its totient is φ = 275939218.

The previous prime is 551878433. The next prime is 551878447. The reversal of 551878438 is 834878155.

It is a semiprime because it is the product of two primes.

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 junction number, because it is equal to n+sod(n) for n = 551878391 and 551878400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551878433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137969608 + ... + 137969611.

It is an arithmetic number, because the mean of its divisors is an integer number (206954415).

Almost surely, 2^551878438 is an apocalyptic number.

551878438 is a deficient number, since it is larger than the sum of its proper divisors (275939222).

551878438 is a wasteful number, since it uses less digits than its factorization.

551878438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275939221.

The product of its digits is 1075200, while the sum is 49.

The square root of 551878438 is about 23492.0930953374. The cubic root of 551878438 is about 820.2529647856.

The spelling of 551878438 in words is "five hundred fifty-one million, eight hundred seventy-eight thousand, four hundred thirty-eight".