181620740 has 48 divisors (see below), whose sum is σ = 438719232. Its totient is φ = 61865856.

The previous prime is 181620731. The next prime is 181620757. The reversal of 181620740 is 47026181.

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, 17849 + ... + 26111.

It is an arithmetic number, because the mean of its divisors is an integer number (9139984).

Almost surely, 2^181620740 is an apocalyptic number.

181620740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 181620740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (219359616).

181620740 is an abundant number, since it is smaller than the sum of its proper divisors (257098492).

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

181620740 is a wasteful number, since it uses less digits than its factorization.

181620740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8436 (or 8434 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 181620740 is about 13476.6739220032. The cubic root of 181620740 is about 566.3111949744.

The spelling of 181620740 in words is "one hundred eighty-one million, six hundred twenty thousand, seven hundred forty".