556540378 has 4 divisors (see below), whose sum is σ = 834810570. Its totient is φ = 278270188.

The previous prime is 556540337. The next prime is 556540399. The reversal of 556540378 is 873045655.

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

It can be written as a sum of positive squares in only one way, i.e., 552391009 + 4149369 = 23503^2 + 2037^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139135093 + ... + 139135096.

Almost surely, 2^556540378 is an apocalyptic number.

556540378 is a deficient number, since it is larger than the sum of its proper divisors (278270192).

556540378 is a wasteful number, since it uses less digits than its factorization.

556540378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278270191.

The product of its (nonzero) digits is 504000, while the sum is 43.

The square root of 556540378 is about 23591.1080282381. The cubic root of 556540378 is about 822.5561608964.

It can be divided in two parts, 5565403 and 78, that multiplied together give a palindrome (434101434).

The spelling of 556540378 in words is "five hundred fifty-six million, five hundred forty thousand, three hundred seventy-eight".