61871720 has 32 divisors (see below), whose sum is σ = 140031720. Its totient is φ = 24602880.

The previous prime is 61871699. The next prime is 61871783. The reversal of 61871720 is 2717816.

It can be written as a sum of positive squares in 4 ways, for example, as 60621796 + 1249924 = 7786^2 + 1118^2 .

It is an unprimeable number.

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, 2450 + ... + 11390.

Almost surely, 2^61871720 is an apocalyptic number.

It is an amenable number.

61871720 is an abundant number, since it is smaller than the sum of its proper divisors (78160000).

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

61871720 is a wasteful number, since it uses less digits than its factorization.

61871720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9125 (or 9121 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 61871720 is about 7865.8578680269. The cubic root of 61871720 is about 395.5160056451.

The spelling of 61871720 in words is "sixty-one million, eight hundred seventy-one thousand, seven hundred twenty".