71721650 has 96 divisors (see below), whose sum is σ = 179238528. Its totient is φ = 20620800.

The previous prime is 71721649. The next prime is 71721701. The reversal of 71721650 is 5612717.

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 47 ways as a sum of consecutive naturals, for example, 49334 + ... + 50766.

It is an arithmetic number, because the mean of its divisors is an integer number (1867068).

Almost surely, 2^71721650 is an apocalyptic number.

71721650 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

71721650 is an abundant number, since it is smaller than the sum of its proper divisors (107516878).

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

71721650 is a wasteful number, since it uses less digits than its factorization.

71721650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1476 (or 1471 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 29.

The square root of 71721650 is about 8468.8635601242. The cubic root of 71721650 is about 415.4799691842.

The spelling of 71721650 in words is "seventy-one million, seven hundred twenty-one thousand, six hundred fifty".