61507872 has 72 divisors (see below), whose sum is σ = 179213580. Its totient is φ = 19998720.

The previous prime is 61507871. The next prime is 61507879. The reversal of 61507872 is 27870516.

It can be written as a sum of positive squares in 2 ways, for example, as 61402896 + 104976 = 7836^2 + 324^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (61507871) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9204 + ... + 14412.

Almost surely, 2^61507872 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 61507872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89606790).

61507872 is an abundant number, since it is smaller than the sum of its proper divisors (117705708).

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

61507872 is a wasteful number, since it uses less digits than its factorization.

61507872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5266 (or 5255 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 61507872 is about 7842.6954550078. The cubic root of 61507872 is about 394.7391794163.

The spelling of 61507872 in words is "sixty-one million, five hundred seven thousand, eight hundred seventy-two".