61206520 has 32 divisors (see below), whose sum is σ = 140317920. Its totient is φ = 24019840.

The previous prime is 61206517. The next prime is 61206533. The reversal of 61206520 is 2560216.

It is a junction number, because it is equal to n+sod(n) for n = 61206491 and 61206500.

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, 12316 + ... + 16555.

It is an arithmetic number, because the mean of its divisors is an integer number (4384935).

Almost surely, 2^61206520 is an apocalyptic number.

It is an amenable number.

61206520 is an abundant number, since it is smaller than the sum of its proper divisors (79111400).

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

61206520 is a wasteful number, since it uses less digits than its factorization.

61206520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28935 (or 28931 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 61206520 is about 7823.4595927889. The cubic root of 61206520 is about 394.0934612985.

Adding to 61206520 its reverse (2560216), we get a palindrome (63766736).

The spelling of 61206520 in words is "sixty-one million, two hundred six thousand, five hundred twenty".