1564949378 has 16 divisors (see below), whose sum is σ = 2435721216. Its totient is φ = 753304320.

The previous prime is 1564949369. The next prime is 1564949437. The reversal of 1564949378 is 8739494651.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53426 + ... + 77357.

It is an arithmetic number, because the mean of its divisors is an integer number (152232576).

Almost surely, 2^1564949378 is an apocalyptic number.

1564949378 is a deficient number, since it is larger than the sum of its proper divisors (870771838).

1564949378 is a wasteful number, since it uses less digits than its factorization.

1564949378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131009.

The product of its digits is 6531840, while the sum is 56.

The square root of 1564949378 is about 39559.4410728969. The cubic root of 1564949378 is about 1161.0032388059.

The spelling of 1564949378 in words is "one billion, five hundred sixty-four million, nine hundred forty-nine thousand, three hundred seventy-eight".