1978079618 has 16 divisors (see below), whose sum is σ = 3071520000. Its totient is φ = 954286032.

The previous prime is 1978079567. The next prime is 1978079627. The reversal of 1978079618 is 8169708791.

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, 80783 + ... + 102381.

It is an arithmetic number, because the mean of its divisors is an integer number (191970000).

Almost surely, 2^1978079618 is an apocalyptic number.

1978079618 is a deficient number, since it is larger than the sum of its proper divisors (1093440382).

1978079618 is a wasteful number, since it uses less digits than its factorization.

1978079618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23209.

The product of its (nonzero) digits is 1524096, while the sum is 56.

The square root of 1978079618 is about 44475.6069997926. The cubic root of 1978079618 is about 1255.3011384044.

The spelling of 1978079618 in words is "one billion, nine hundred seventy-eight million, seventy-nine thousand, six hundred eighteen".