61505140 has 48 divisors (see below), whose sum is σ = 134265600. Its totient is φ = 23649152.

The previous prime is 61505131. The next prime is 61505149. The reversal of 61505140 is 4150516.

It is an interprime number because it is at equal distance from previous prime (61505131) and next prime (61505149).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61505149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54906 + ... + 56014.

It is an arithmetic number, because the mean of its divisors is an integer number (2797200).

Almost surely, 2^61505140 is an apocalyptic number.

It is an amenable number.

61505140 is an abundant number, since it is smaller than the sum of its proper divisors (72760460).

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

61505140 is a wasteful number, since it uses less digits than its factorization.

61505140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1224 (or 1222 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 61505140 is about 7842.5212782625. The cubic root of 61505140 is about 394.7333349427.

Adding to 61505140 its reverse (4150516), we get a palindrome (65655656).

The spelling of 61505140 in words is "sixty-one million, five hundred five thousand, one hundred forty".