61320438 has 48 divisors (see below), whose sum is σ = 140605920. Its totient is φ = 19274112.

The previous prime is 61320421. The next prime is 61320443. The reversal of 61320438 is 83402316.

It is a happy number.

61320438 is a `hidden beast` number, since 613 + 2 + 0 + 43 + 8 = 666.

It is a super-2 number, since 2×61320438² = 7520392233023688, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29208 + ... + 31236.

It is an arithmetic number, because the mean of its divisors is an integer number (2929290).

Almost surely, 2^61320438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61320438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70302960).

61320438 is an abundant number, since it is smaller than the sum of its proper divisors (79285482).

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

61320438 is a wasteful number, since it uses less digits than its factorization.

61320438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2133 (or 2130 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 61320438 is about 7830.7367469479. The cubic root of 61320438 is about 394.3378062644.

The spelling of 61320438 in words is "sixty-one million, three hundred twenty thousand, four hundred thirty-eight".