61721552 has 40 divisors (see below), whose sum is σ = 122700480. Its totient is φ = 30067200.

The previous prime is 61721549. The next prime is 61721563. The reversal of 61721552 is 25512716.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142328 + ... + 142760.

It is an arithmetic number, because the mean of its divisors is an integer number (3067512).

Almost surely, 2^61721552 is an apocalyptic number.

It is an amenable number.

61721552 is a deficient number, since it is larger than the sum of its proper divisors (60978928).

61721552 is a wasteful number, since it uses less digits than its factorization.

61721552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651 (or 645 counting only the distinct ones).

The product of its digits is 4200, while the sum is 29.

The square root of 61721552 is about 7856.3065113322. The cubic root of 61721552 is about 395.1957626016.

The spelling of 61721552 in words is "sixty-one million, seven hundred twenty-one thousand, five hundred fifty-two".