71772920 has 16 divisors (see below), whose sum is σ = 161489160. Its totient is φ = 28709152.

The previous prime is 71772917. The next prime is 71772931. The reversal of 71772920 is 2927717.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 897122 + ... + 897201.

Almost surely, 2^71772920 is an apocalyptic number.

It is an amenable number.

71772920 is an abundant number, since it is smaller than the sum of its proper divisors (89716240).

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

71772920 is a wasteful number, since it uses less digits than its factorization.

71772920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1794334 (or 1794330 counting only the distinct ones).

The product of its (nonzero) digits is 12348, while the sum is 35.

The square root of 71772920 is about 8471.8899898429. The cubic root of 71772920 is about 415.5789471275.

It can be divided in two parts, 717 and 72920, that added together give a palindrome (73637).

The spelling of 71772920 in words is "seventy-one million, seven hundred seventy-two thousand, nine hundred twenty".