61395440 has 20 divisors (see below), whose sum is σ = 142744584. Its totient is φ = 24558144.

The previous prime is 61395437. The next prime is 61395457. The reversal of 61395440 is 4459316.

61395440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 61395397 and 61395406.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 383642 + ... + 383801.

Almost surely, 2^61395440 is an apocalyptic number.

It is an amenable number.

61395440 is an abundant number, since it is smaller than the sum of its proper divisors (81349144).

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

61395440 is a wasteful number, since it uses less digits than its factorization.

61395440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 767456 (or 767450 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 61395440 is about 7835.5242326216. The cubic root of 61395440 is about 394.4985143685.

The spelling of 61395440 in words is "sixty-one million, three hundred ninety-five thousand, four hundred forty".