61547500 has 60 divisors (see below), whose sum is σ = 153863248. Its totient is φ = 21096000.

The previous prime is 61547489. The next prime is 61547501. The reversal of 61547500 is 574516.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (61547501) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 15742 + ... + 19258.

Almost surely, 2^61547500 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 61547500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76931624).

61547500 is an abundant number, since it is smaller than the sum of its proper divisors (92315748).

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

61547500 is a wasteful number, since it uses less digits than its factorization.

61547500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3548 (or 3531 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 61547500 is about 7845.2214755225. The cubic root of 61547500 is about 394.8239347790.

The spelling of 61547500 in words is "sixty-one million, five hundred forty-seven thousand, five hundred".