1645427878 has 16 divisors (see below), whose sum is σ = 2495671920. Its totient is φ = 813551616.

The previous prime is 1645427831. The next prime is 1645427899. The reversal of 1645427878 is 8787245461.

It is a congruent 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, 292678 + ... + 298246.

It is an arithmetic number, because the mean of its divisors is an integer number (155979495).

Almost surely, 2^1645427878 is an apocalyptic number.

1645427878 is a deficient number, since it is larger than the sum of its proper divisors (850244042).

1645427878 is a wasteful number, since it uses less digits than its factorization.

1645427878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7191.

The product of its digits is 3010560, while the sum is 52.

The square root of 1645427878 is about 40563.8740506870. The cubic root of 1645427878 is about 1180.5732821943.

The spelling of 1645427878 in words is "one billion, six hundred forty-five million, four hundred twenty-seven thousand, eight hundred seventy-eight".