61065440 has 24 divisors (see below), whose sum is σ = 144267480. Its totient is φ = 24426112.

The previous prime is 61065427. The next prime is 61065463. The reversal of 61065440 is 4456016.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190670 + ... + 190989.

It is an arithmetic number, because the mean of its divisors is an integer number (6011145).

Almost surely, 2^61065440 is an apocalyptic number.

It is an amenable number.

61065440 is an abundant number, since it is smaller than the sum of its proper divisors (83202040).

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

61065440 is a wasteful number, since it uses less digits than its factorization.

61065440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381674 (or 381666 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 61065440 is about 7814.4379196459. The cubic root of 61065440 is about 393.7904354208.

The spelling of 61065440 in words is "sixty-one million, sixty-five thousand, four hundred forty".