61057530 has 64 divisors (see below), whose sum is σ = 164505600. Its totient is φ = 16113600.

The previous prime is 61057519. The next prime is 61057567. The reversal of 61057530 is 3575016.

61057530 is a `hidden beast` number, since 61 + 0 + 575 + 30 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 61057494 and 61057503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26151 + ... + 28389.

It is an arithmetic number, because the mean of its divisors is an integer number (2570400).

Almost surely, 2^61057530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61057530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82252800).

61057530 is an abundant number, since it is smaller than the sum of its proper divisors (103448070).

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

61057530 is a wasteful number, since it uses less digits than its factorization.

61057530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2356 (or 2350 counting only the distinct ones).

The product of its (nonzero) digits is 3150, while the sum is 27.

The square root of 61057530 is about 7813.9317887988. The cubic root of 61057530 is about 393.7734317121.

The spelling of 61057530 in words is "sixty-one million, fifty-seven thousand, five hundred thirty".