70221920 has 24 divisors (see below), whose sum is σ = 165899664. Its totient is φ = 28088704.

The previous prime is 70221887. The next prime is 70221923. The reversal of 70221920 is 2912207.

It is a super-2 number, since 2×70221920² = 9862236096972800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70221923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219284 + ... + 219603.

It is an arithmetic number, because the mean of its divisors is an integer number (6912486).

Almost surely, 2^70221920 is an apocalyptic number.

It is an amenable number.

70221920 is an abundant number, since it is smaller than the sum of its proper divisors (95677744).

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

70221920 is a wasteful number, since it uses less digits than its factorization.

70221920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438902 (or 438894 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 70221920 is about 8379.8520273332. The cubic root of 70221920 is about 412.5635922773.

It can be divided in two parts, 702 and 21920, that added together give a palindrome (22622).

The spelling of 70221920 in words is "seventy million, two hundred twenty-one thousand, nine hundred twenty".