161543790 has 48 divisors (see below), whose sum is σ = 433570176. Its totient is φ = 41688000.

The previous prime is 161543771. The next prime is 161543797. The reversal of 161543790 is 97345161.

161543790 is a `hidden beast` number, since 1 + 615 + 4 + 37 + 9 + 0 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161543797) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26161 + ... + 31740.

It is an arithmetic number, because the mean of its divisors is an integer number (9032712).

Almost surely, 2^161543790 is an apocalyptic number.

161543790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161543790 is an abundant number, since it is smaller than the sum of its proper divisors (272026386).

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

161543790 is a wasteful number, since it uses less digits than its factorization.

161543790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57945 (or 57942 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 161543790 is about 12709.9878048722. The cubic root of 161543790 is about 544.6239753928.

The spelling of 161543790 in words is "one hundred sixty-one million, five hundred forty-three thousand, seven hundred ninety".