75721552 has 20 divisors (see below), whose sum is σ = 151770420. Its totient is φ = 36555008.

The previous prime is 75721549. The next prime is 75721627. The reversal of 75721552 is 25512757.

It can be written as a sum of positive squares in 2 ways, for example, as 61402896 + 14318656 = 7836^2 + 3784^2 .

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 81133 + ... + 82060.

It is an arithmetic number, because the mean of its divisors is an integer number (7588521).

Almost surely, 2^75721552 is an apocalyptic number.

It is an amenable number.

75721552 is an abundant number, since it is smaller than the sum of its proper divisors (76048868).

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

75721552 is a wasteful number, since it uses less digits than its factorization.

75721552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163230 (or 163224 counting only the distinct ones).

The product of its digits is 24500, while the sum is 34.

The square root of 75721552 is about 8701.8131443970. The cubic root of 75721552 is about 423.0644198416.

The spelling of 75721552 in words is "seventy-five million, seven hundred twenty-one thousand, five hundred fifty-two".