61559772 has 48 divisors (see below), whose sum is σ = 153068160. Its totient is φ = 19199808.

The previous prime is 61559767. The next prime is 61559783. The reversal of 61559772 is 27795516.

It is a super-4 number, since 4×61559772⁴ (a number of 32 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17298 + ... + 20550.

It is an arithmetic number, because the mean of its divisors is an integer number (3188920).

Almost surely, 2^61559772 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 61559772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76534080).

61559772 is an abundant number, since it is smaller than the sum of its proper divisors (91508388).

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

61559772 is a wasteful number, since it uses less digits than its factorization.

61559772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3362 (or 3360 counting only the distinct ones).

The product of its digits is 132300, while the sum is 42.

The square root of 61559772 is about 7846.0035686966. The cubic root of 61559772 is about 394.8501744439.

The spelling of 61559772 in words is "sixty-one million, five hundred fifty-nine thousand, seven hundred seventy-two".