720172851 has 8 divisors (see below), whose sum is σ = 978348240. Its totient is φ = 471056352.

The previous prime is 720172837. The next prime is 720172861. The reversal of 720172851 is 158271027.

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

It is not a de Polignac number, because 720172851 - 2⁶ = 720172787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (720172801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2264536 + ... + 2264853.

It is an arithmetic number, because the mean of its divisors is an integer number (122293530).

Almost surely, 2^720172851 is an apocalyptic number.

720172851 is a deficient number, since it is larger than the sum of its proper divisors (258175389).

720172851 is a wasteful number, since it uses less digits than its factorization.

720172851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4529445.

The product of its (nonzero) digits is 7840, while the sum is 33.

The square root of 720172851 is about 26836.0364249268. The cubic root of 720172851 is about 896.3526672107.

The spelling of 720172851 in words is "seven hundred twenty million, one hundred seventy-two thousand, eight hundred fifty-one".