61511552 has 64 divisors (see below), whose sum is σ = 129070800. Its totient is φ = 29159424.

The previous prime is 61511539. The next prime is 61511557. The reversal of 61511552 is 25511516.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61511557) 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, 270863 + ... + 271089.

Almost surely, 2^61511552 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 61511552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64535400).

61511552 is an abundant number, since it is smaller than the sum of its proper divisors (67559248).

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

61511552 is a wasteful number, since it uses less digits than its factorization.

61511552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343 (or 331 counting only the distinct ones).

The product of its digits is 1500, while the sum is 26.

The square root of 61511552 is about 7842.9300647143. The cubic root of 61511552 is about 394.7470516402.

It can be divided in two parts, 615 and 11552, that added together give a cube (12167 = 23³).

The spelling of 61511552 in words is "sixty-one million, five hundred eleven thousand, five hundred fifty-two".