61442442 has 64 divisors (see below), whose sum is σ = 142940160. Its totient is φ = 19544112.

The previous prime is 61442431. The next prime is 61442461. The reversal of 61442442 is 24424416.

It is a happy number.

61442442 is a `hidden beast` number, since 614 + 4 + 2 + 4 + 42 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 108853 + ... + 109415.

It is an arithmetic number, because the mean of its divisors is an integer number (2233440).

Almost surely, 2^61442442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61442442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71470080).

61442442 is an abundant number, since it is smaller than the sum of its proper divisors (81497718).

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

61442442 is a wasteful number, since it uses less digits than its factorization.

61442442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664 (or 658 counting only the distinct ones).

The product of its digits is 6144, while the sum is 27.

The square root of 61442442 is about 7838.5229475967. The cubic root of 61442442 is about 394.5991596794.

Adding to 61442442 its reverse (24424416), we get a palindrome (85866858).

It can be divided in two parts, 61 and 442442, that multiplied together give a palindrome (26988962).

The spelling of 61442442 in words is "sixty-one million, four hundred forty-two thousand, four hundred forty-two".