61581552 has 40 divisors (see below), whose sum is σ = 159372240. Its totient is φ = 20490240.

The previous prime is 61581539. The next prime is 61581577. The reversal of 61581552 is 25518516.

It is a congruent number.

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, 43902 + ... + 45282.

It is an arithmetic number, because the mean of its divisors is an integer number (3984306).

Almost surely, 2^61581552 is an apocalyptic number.

It is an amenable number.

61581552 is an abundant number, since it is smaller than the sum of its proper divisors (97790688).

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

61581552 is a wasteful number, since it uses less digits than its factorization.

61581552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2321 (or 2315 counting only the distinct ones).

The product of its digits is 12000, while the sum is 33.

The square root of 61581552 is about 7847.3914137119. The cubic root of 61581552 is about 394.8967352769.

The spelling of 61581552 in words is "sixty-one million, five hundred eighty-one thousand, five hundred fifty-two".