161687754 has 24 divisors (see below), whose sum is σ = 361625472. Its totient is φ = 52157160.

The previous prime is 161687741. The next prime is 161687791. The reversal of 161687754 is 457786161.

It is a super-2 number, since 2×161687754² = 52285859587129032, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 144324 + ... + 145439.

It is an arithmetic number, because the mean of its divisors is an integer number (15067728).

Almost surely, 2^161687754 is an apocalyptic number.

161687754 is an abundant number, since it is smaller than the sum of its proper divisors (199937718).

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

161687754 is a wasteful number, since it uses less digits than its factorization.

161687754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289802 (or 289799 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 161687754 is about 12715.6499637258. The cubic root of 161687754 is about 544.7857126866.

The spelling of 161687754 in words is "one hundred sixty-one million, six hundred eighty-seven thousand, seven hundred fifty-four".