61729722 has 16 divisors (see below), whose sum is σ = 137177280. Its totient is φ = 20576556.

The previous prime is 61729721. The next prime is 61729729. The reversal of 61729722 is 22792716.

It is not an unprimeable number, because it can be changed into a prime (61729721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 571518 + ... + 571625.

It is an arithmetic number, because the mean of its divisors is an integer number (8573580).

Almost surely, 2^61729722 is an apocalyptic number.

61729722 is an abundant number, since it is smaller than the sum of its proper divisors (75447558).

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

61729722 is a wasteful number, since it uses less digits than its factorization.

61729722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1143154 (or 1143148 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 61729722 is about 7856.8264585646. The cubic root of 61729722 is about 395.2131990120.

The spelling of 61729722 in words is "sixty-one million, seven hundred twenty-nine thousand, seven hundred twenty-two".