61206540 has 24 divisors (see below), whose sum is σ = 171378480. Its totient is φ = 16321728.

The previous prime is 61206539. The next prime is 61206553. The reversal of 61206540 is 4560216.

It is a self number, because there is not a number n which added to its sum of digits gives 61206540.

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, 509995 + ... + 510114.

It is an arithmetic number, because the mean of its divisors is an integer number (7140770).

Almost surely, 2^61206540 is an apocalyptic number.

61206540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61206540 is an abundant number, since it is smaller than the sum of its proper divisors (110171940).

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

61206540 is a wasteful number, since it uses less digits than its factorization.

61206540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020121 (or 1020119 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 61206540 is about 7823.4608709956. The cubic root of 61206540 is about 394.0935042235.

Adding to 61206540 its reverse (4560216), we get a palindrome (65766756).

The spelling of 61206540 in words is "sixty-one million, two hundred six thousand, five hundred forty".