161420644 has 48 divisors (see below), whose sum is σ = 372919680. Its totient is φ = 59189760.

The previous prime is 161420639. The next prime is 161420657. The reversal of 161420644 is 446024161.

161420644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10179 + ... + 20650.

It is an arithmetic number, because the mean of its divisors is an integer number (7769160).

Almost surely, 2^161420644 is an apocalyptic number.

161420644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

161420644 is an abundant number, since it is smaller than the sum of its proper divisors (211499036).

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

161420644 is a wasteful number, since it uses less digits than its factorization.

161420644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30868 (or 30866 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 161420644 is about 12705.1424234441. The cubic root of 161420644 is about 544.4855499469.

The spelling of 161420644 in words is "one hundred sixty-one million, four hundred twenty thousand, six hundred forty-four".