72221870 has 16 divisors (see below), whose sum is σ = 148570848. Its totient is φ = 24761760.

The previous prime is 72221837. The next prime is 72221873. The reversal of 72221870 is 7812227.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72221873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 515801 + ... + 515940.

It is an arithmetic number, because the mean of its divisors is an integer number (9285678).

Almost surely, 2^72221870 is an apocalyptic number.

72221870 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

72221870 is an abundant number, since it is smaller than the sum of its proper divisors (76348978).

72221870 is a wasteful number, since it uses less digits than its factorization.

72221870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1031755.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 72221870 is about 8498.3451330244. The cubic root of 72221870 is about 416.4436488304.

The spelling of 72221870 in words is "seventy-two million, two hundred twenty-one thousand, eight hundred seventy".