61711572 has 48 divisors (see below), whose sum is σ = 157223360. Its totient is φ = 18724608.

The previous prime is 61711571. The next prime is 61711583. The reversal of 61711572 is 27511716.

It is a super-2 number, since 2×61711572² = 7616636237422368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61711571) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8679 + ... + 14097.

Almost surely, 2^61711572 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 61711572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78611680).

61711572 is an abundant number, since it is smaller than the sum of its proper divisors (95511788).

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

61711572 is a wasteful number, since it uses less digits than its factorization.

61711572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5512 (or 5510 counting only the distinct ones).

The product of its digits is 2940, while the sum is 30.

The square root of 61711572 is about 7855.6713271368. The cubic root of 61711572 is about 395.1744612021.

The spelling of 61711572 in words is "sixty-one million, seven hundred eleven thousand, five hundred seventy-two".