61844540 has 24 divisors (see below), whose sum is σ = 130827312. Its totient is φ = 24556160.

The previous prime is 61844537. The next prime is 61844543. The reversal of 61844540 is 4544816.

It is an interprime number because it is at equal distance from previous prime (61844537) and next prime (61844543).

It is a junction number, because it is equal to n+sod(n) for n = 61844497 and 61844506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61844543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8546 + ... + 14025.

It is an arithmetic number, because the mean of its divisors is an integer number (5451138).

Almost surely, 2^61844540 is an apocalyptic number.

It is an amenable number.

61844540 is an abundant number, since it is smaller than the sum of its proper divisors (68982772).

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

61844540 is a wasteful number, since it uses less digits than its factorization.

61844540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22717 (or 22715 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 61844540 is about 7864.1299582344. The cubic root of 61844540 is about 395.4580809606.

The spelling of 61844540 in words is "sixty-one million, eight hundred forty-four thousand, five hundred forty".