61615040 has 28 divisors (see below), whose sum is σ = 146721576. Its totient is φ = 24645888.

The previous prime is 61615039. The next prime is 61615051. The reversal of 61615040 is 4051616.

It is a junction number, because it is equal to n+sod(n) for n = 61614997 and 61615015.

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, 95954 + ... + 96593.

Almost surely, 2^61615040 is an apocalyptic number.

It is an amenable number.

61615040 is an abundant number, since it is smaller than the sum of its proper divisors (85106536).

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

61615040 is a wasteful number, since it uses less digits than its factorization.

61615040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192564 (or 192554 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 61615040 is about 7849.5248263828. The cubic root of 61615040 is about 394.9683038178.

Adding to 61615040 its reverse (4051616), we get a palindrome (65666656).

The spelling of 61615040 in words is "sixty-one million, six hundred fifteen thousand, forty".