561772378 has 16 divisors (see below), whose sum is σ = 931020480. Its totient is φ = 252869056.

The previous prime is 561772333. The next prime is 561772391. The reversal of 561772378 is 873277165.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 358408 + ... + 359971.

It is an arithmetic number, because the mean of its divisors is an integer number (58188780).

Almost surely, 2^561772378 is an apocalyptic number.

561772378 is a deficient number, since it is larger than the sum of its proper divisors (369248102).

561772378 is a wasteful number, since it uses less digits than its factorization.

561772378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 718421.

The product of its digits is 493920, while the sum is 46.

The square root of 561772378 is about 23701.7378687724. The cubic root of 561772378 is about 825.1257245799.

The spelling of 561772378 in words is "five hundred sixty-one million, seven hundred seventy-two thousand, three hundred seventy-eight".