1978112160 has 72 divisors (see below), whose sum is σ = 6750312660. Its totient is φ = 527496192.

The previous prime is 1978112137. The next prime is 1978112177. The reversal of 1978112160 is 612118791.

It can be written as a sum of positive squares in 2 ways, for example, as 1970294544 + 7817616 = 44388^2 + 2796^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 685405 + ... + 688284.

Almost surely, 2^1978112160 is an apocalyptic number.

1978112160 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1978112160 is an abundant number, since it is smaller than the sum of its proper divisors (4772200500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1978112160 is a wasteful number, since it uses less digits than its factorization.

1978112160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1373710 (or 1373699 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 36.

The square root of 1978112160 is about 44475.9728392758. The cubic root of 1978112160 is about 1255.3080221492.

The spelling of 1978112160 in words is "one billion, nine hundred seventy-eight million, one hundred twelve thousand, one hundred sixty".