1978620022 has 4 divisors (see below), whose sum is σ = 2967930036. Its totient is φ = 989310010.

The previous prime is 1978620019. The next prime is 1978620037. The reversal of 1978620022 is 2200268791.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494655004 + ... + 494655007.

It is an arithmetic number, because the mean of its divisors is an integer number (741982509).

Almost surely, 2^1978620022 is an apocalyptic number.

1978620022 is a deficient number, since it is larger than the sum of its proper divisors (989310014).

1978620022 is an equidigital number, since it uses as much as digits as its factorization.

1978620022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989310013.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 1978620022 is about 44481.6818701811. The cubic root of 1978620022 is about 1255.4154425311.

The spelling of 1978620022 in words is "one billion, nine hundred seventy-eight million, six hundred twenty thousand, twenty-two".