61560440 has 16 divisors (see below), whose sum is σ = 138511080. Its totient is φ = 24624160.

The previous prime is 61560439. The next prime is 61560463. The reversal of 61560440 is 4406516.

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, 769466 + ... + 769545.

Almost surely, 2^61560440 is an apocalyptic number.

It is an amenable number.

61560440 is an abundant number, since it is smaller than the sum of its proper divisors (76950640).

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

61560440 is a wasteful number, since it uses less digits than its factorization.

61560440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1539022 (or 1539018 counting only the distinct ones).

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

The square root of 61560440 is about 7846.0461380239. The cubic root of 61560440 is about 394.8516026437.

Adding to 61560440 its reverse (4406516), we get a palindrome (65966956).

The spelling of 61560440 in words is "sixty-one million, five hundred sixty thousand, four hundred forty".