61189440 has 112 divisors (see below), whose sum is σ = 209263488. Its totient is φ = 15058944.

The previous prime is 61189399. The next prime is 61189451. The reversal of 61189440 is 4498116.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10029 + ... + 14931.

It is an arithmetic number, because the mean of its divisors is an integer number (1868424).

Almost surely, 2^61189440 is an apocalyptic number.

61189440 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 61189440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104631744).

61189440 is an abundant number, since it is smaller than the sum of its proper divisors (148074048).

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

61189440 is a wasteful number, since it uses less digits than its factorization.

61189440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4936 (or 4926 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 61189440 is about 7822.3679279359. The cubic root of 61189440 is about 394.0567999399.

The spelling of 61189440 in words is "sixty-one million, one hundred eighty-nine thousand, four hundred forty".