61154440 has 64 divisors (see below), whose sum is σ = 146966400. Its totient is φ = 22821888.

The previous prime is 61154399. The next prime is 61154461. The reversal of 61154440 is 4445116.

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, 94197 + ... + 94843.

It is an arithmetic number, because the mean of its divisors is an integer number (2296350).

Almost surely, 2^61154440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61154440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73483200).

61154440 is an abundant number, since it is smaller than the sum of its proper divisors (85811960).

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

61154440 is a wasteful number, since it uses less digits than its factorization.

61154440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814 (or 810 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 61154440 is about 7820.1304336948. The cubic root of 61154440 is about 393.9816528858.

Adding to 61154440 its reverse (4445116), we get a palindrome (65599556).

The spelling of 61154440 in words is "sixty-one million, one hundred fifty-four thousand, four hundred forty".