61327440 has 120 divisors (see below), whose sum is σ = 216846240. Its totient is φ = 15489792.

The previous prime is 61327439. The next prime is 61327447. The reversal of 61327440 is 4472316.

61327440 is a `hidden beast` number, since 613 + 2 + 7 + 4 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×61327440² = 7522109793907200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61327447) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11439 + ... + 15921.

It is an arithmetic number, because the mean of its divisors is an integer number (1807052).

Almost surely, 2^61327440 is an apocalyptic number.

61327440 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 61327440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108423120).

61327440 is an abundant number, since it is smaller than the sum of its proper divisors (155518800).

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

61327440 is a wasteful number, since it uses less digits than its factorization.

61327440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4521 (or 4512 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 61327440 is about 7831.1838185551. The cubic root of 61327440 is about 394.3528151170.

Adding to 61327440 its reverse (4472316), we get a palindrome (65799756).

The spelling of 61327440 in words is "sixty-one million, three hundred twenty-seven thousand, four hundred forty".