61242840 has 96 divisors (see below), whose sum is σ = 210768480. Its totient is φ = 15369216.

The previous prime is 61242827. The next prime is 61242877. The reversal of 61242840 is 4824216.

61242840 is a `hidden beast` number, since 612 + 4 + 2 + 8 + 40 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1117 + ... + 11123.

It is an arithmetic number, because the mean of its divisors is an integer number (2195505).

Almost surely, 2^61242840 is an apocalyptic number.

61242840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61242840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105384240).

61242840 is an abundant number, since it is smaller than the sum of its proper divisors (149525640).

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

61242840 is a wasteful number, since it uses less digits than its factorization.

61242840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10041 (or 10034 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 61242840 is about 7825.7804722596. The cubic root of 61242840 is about 394.1713976809.

The spelling of 61242840 in words is "sixty-one million, two hundred forty-two thousand, eight hundred forty".