61081504 has 48 divisors (see below), whose sum is σ = 138106080. Its totient is φ = 26300160.

The previous prime is 61081483. The next prime is 61081567. The reversal of 61081504 is 40518016.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2122 + ... + 11254.

It is an arithmetic number, because the mean of its divisors is an integer number (2877210).

Almost surely, 2^61081504 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 61081504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69053040).

61081504 is an abundant number, since it is smaller than the sum of its proper divisors (77024576).

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

61081504 is a wasteful number, since it uses less digits than its factorization.

61081504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9173 (or 9165 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 61081504 is about 7815.4656930985. The cubic root of 61081504 is about 393.8249628334.

The spelling of 61081504 in words is "sixty-one million, eighty-one thousand, five hundred four".