61721076 has 12 divisors (see below), whose sum is σ = 144015872. Its totient is φ = 20573688.

The previous prime is 61721071. The next prime is 61721123. The reversal of 61721076 is 67012716.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61721071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2571700 + ... + 2571723.

Almost surely, 2^61721076 is an apocalyptic number.

It is an amenable number.

61721076 is an abundant number, since it is smaller than the sum of its proper divisors (82294796).

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

61721076 is a wasteful number, since it uses less digits than its factorization.

61721076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5143430 (or 5143428 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 61721076 is about 7856.2762171400. The cubic root of 61721076 is about 395.1947466752.

The spelling of 61721076 in words is "sixty-one million, seven hundred twenty-one thousand, seventy-six".