161378638 has 8 divisors (see below), whose sum is σ = 243916200. Its totient is φ = 80073240.

The previous prime is 161378621. The next prime is 161378663. The reversal of 161378638 is 836873161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×161378638³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161378594 and 161378603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 307713 + ... + 308236.

It is an arithmetic number, because the mean of its divisors is an integer number (30489525).

Almost surely, 2^161378638 is an apocalyptic number.

161378638 is a deficient number, since it is larger than the sum of its proper divisors (82537562).

161378638 is a wasteful number, since it uses less digits than its factorization.

161378638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616082.

The product of its digits is 145152, while the sum is 43.

The square root of 161378638 is about 12703.4892057261. The cubic root of 161378638 is about 544.4383159136.

The spelling of 161378638 in words is "one hundred sixty-one million, three hundred seventy-eight thousand, six hundred thirty-eight".