61712840 has 32 divisors (see below), whose sum is σ = 158690880. Its totient is φ = 21158592.

The previous prime is 61712789. The next prime is 61712843. The reversal of 61712840 is 4821716.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (61712843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109922 + ... + 110481.

It is an arithmetic number, because the mean of its divisors is an integer number (4959090).

Almost surely, 2^61712840 is an apocalyptic number.

It is an amenable number.

61712840 is an abundant number, since it is smaller than the sum of its proper divisors (96978040).

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

61712840 is a wasteful number, since it uses less digits than its factorization.

61712840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220421 (or 220417 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 61712840 is about 7855.7520327465. The cubic root of 61712840 is about 395.1771677598.

The spelling of 61712840 in words is "sixty-one million, seven hundred twelve thousand, eight hundred forty".