61583540 has 24 divisors (see below), whose sum is σ = 132822312. Its totient is φ = 23967360.

The previous prime is 61583527. The next prime is 61583567. The reversal of 61583540 is 4538516.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16048036 + 45535504 = 4006^2 + 6748^2 .

It is a junction number, because it is equal to n+sod(n) for n = 61583497 and 61583506.

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, 40871 + ... + 42350.

It is an arithmetic number, because the mean of its divisors is an integer number (5534263).

Almost surely, 2^61583540 is an apocalyptic number.

It is an amenable number.

61583540 is an abundant number, since it is smaller than the sum of its proper divisors (71238772).

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

61583540 is a wasteful number, since it uses less digits than its factorization.

61583540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83267 (or 83265 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 61583540 is about 7847.5180789852. The cubic root of 61583540 is about 394.9009846353.

The spelling of 61583540 in words is "sixty-one million, five hundred eighty-three thousand, five hundred forty".