61721088 has 160 divisors (see below), whose sum is σ = 193862592. Its totient is φ = 17203200.

The previous prime is 61721071. The next prime is 61721123. The reversal of 61721088 is 88012716.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

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 15 ways as a sum of consecutive naturals, for example, 219508 + ... + 219788.

Almost surely, 2^61721088 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61721088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96931296).

61721088 is an abundant number, since it is smaller than the sum of its proper divisors (132141504).

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

61721088 is a wasteful number, since it uses less digits than its factorization.

61721088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326 (or 310 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 61721088 is about 7856.2769808606. The cubic root of 61721088 is about 395.1947722868.

It can be divided in two parts, 6172 and 1088, that added together give a triangular number (7260 = T₁₂₀).

The spelling of 61721088 in words is "sixty-one million, seven hundred twenty-one thousand, eighty-eight".