61142040 has 160 divisors (see below), whose sum is σ = 208565280. Its totient is φ = 16063488.

The previous prime is 61142017. The next prime is 61142077. The reversal of 61142040 is 4024116.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 366037 + ... + 366203.

It is an arithmetic number, because the mean of its divisors is an integer number (1303533).

Almost surely, 2^61142040 is an apocalyptic number.

61142040 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 61142040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104282640).

61142040 is an abundant number, since it is smaller than the sum of its proper divisors (147423240).

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

61142040 is a wasteful number, since it uses less digits than its factorization.

61142040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303 (or 290 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 61142040 is about 7819.3375678506. The cubic root of 61142040 is about 393.9550224796.

Adding to 61142040 its reverse (4024116), we get a palindrome (65166156).

The spelling of 61142040 in words is "sixty-one million, one hundred forty-two thousand, forty".