61242140 has 12 divisors (see below), whose sum is σ = 128608536. Its totient is φ = 24496848.

The previous prime is 61242133. The next prime is 61242161. The reversal of 61242140 is 4124216.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 3062107 = 61242140 / (6 + 1 + 2 + 4 + 2 + 1 + 4 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1531034 + ... + 1531073.

It is an arithmetic number, because the mean of its divisors is an integer number (10717378).

Almost surely, 2^61242140 is an apocalyptic number.

It is an amenable number.

61242140 is an abundant number, since it is smaller than the sum of its proper divisors (67366396).

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

61242140 is a wasteful number, since it uses less digits than its factorization.

61242140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3062116 (or 3062114 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 61242140 is about 7825.7357481581. The cubic root of 61242140 is about 394.1698958943.

Adding to 61242140 its reverse (4124216), we get a palindrome (65366356).

The spelling of 61242140 in words is "sixty-one million, two hundred forty-two thousand, one hundred forty".