61161440 has 48 divisors (see below), whose sum is σ = 144970560. Its totient is φ = 24384000.

The previous prime is 61161431. The next prime is 61161469. The reversal of 61161440 is 4416116.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81065 + ... + 81815.

It is an arithmetic number, because the mean of its divisors is an integer number (3020220).

Almost surely, 2^61161440 is an apocalyptic number.

It is an amenable number.

61161440 is an abundant number, since it is smaller than the sum of its proper divisors (83809120).

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

61161440 is a wasteful number, since it uses less digits than its factorization.

61161440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275 (or 1267 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 61161440 is about 7820.5779837554. The cubic root of 61161440 is about 393.9966845899.

Adding to 61161440 its reverse (4416116), we get a palindrome (65577556).

The spelling of 61161440 in words is "sixty-one million, one hundred sixty-one thousand, four hundred forty".