172220378 has 8 divisors (see below), whose sum is σ = 281815200. Its totient is φ = 78281980.

The previous prime is 172220339. The next prime is 172220393. The reversal of 172220378 is 873022271.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3914078 + ... + 3914121.

It is an arithmetic number, because the mean of its divisors is an integer number (35226900).

Almost surely, 2^172220378 is an apocalyptic number.

172220378 is a deficient number, since it is larger than the sum of its proper divisors (109594822).

172220378 is a wasteful number, since it uses less digits than its factorization.

172220378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7828212.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 172220378 is about 13123.2761915613. The cubic root of 172220378 is about 556.3671922754.

The spelling of 172220378 in words is "one hundred seventy-two million, two hundred twenty thousand, three hundred seventy-eight".