561278438 has 48 divisors (see below), whose sum is σ = 1010593584. Its totient is φ = 232968960.

The previous prime is 561278429. The next prime is 561278461. The reversal of 561278438 is 834872165.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 654506 + ... + 655362.

It is an arithmetic number, because the mean of its divisors is an integer number (21054033).

Almost surely, 2^561278438 is an apocalyptic number.

561278438 is a deficient number, since it is larger than the sum of its proper divisors (449315146).

561278438 is a wasteful number, since it uses less digits than its factorization.

561278438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077 (or 1070 counting only the distinct ones).

The product of its digits is 322560, while the sum is 44.

The square root of 561278438 is about 23691.3156662943. The cubic root of 561278438 is about 824.8838222692.

The spelling of 561278438 in words is "five hundred sixty-one million, two hundred seventy-eight thousand, four hundred thirty-eight".