1612779920 has 20 divisors (see below), whose sum is σ = 3749713500. Its totient is φ = 645111936.

The previous prime is 1612779913. The next prime is 1612779923. The reversal of 1612779920 is 299772161.

It can be written as a sum of positive squares in 2 ways, for example, as 208629136 + 1404150784 = 14444^2 + 37472^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1612779923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10079795 + ... + 10079954.

It is an arithmetic number, because the mean of its divisors is an integer number (187485675).

Almost surely, 2^1612779920 is an apocalyptic number.

1612779920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1612779920 is an abundant number, since it is smaller than the sum of its proper divisors (2136933580).

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

1612779920 is a wasteful number, since it uses less digits than its factorization.

1612779920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20159762 (or 20159756 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 1612779920 is about 40159.4312708733. The cubic root of 1612779920 is about 1172.7129001485.

The spelling of 1612779920 in words is "one billion, six hundred twelve million, seven hundred seventy-nine thousand, nine hundred twenty".