61877240 has 64 divisors (see below), whose sum is σ = 145152000. Its totient is φ = 23713920.

The previous prime is 61877237. The next prime is 61877251. The reversal of 61877240 is 4277816.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 61877240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172181 + ... + 172539.

It is an arithmetic number, because the mean of its divisors is an integer number (2268000).

Almost surely, 2^61877240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61877240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72576000).

61877240 is an abundant number, since it is smaller than the sum of its proper divisors (83274760).

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

61877240 is a wasteful number, since it uses less digits than its factorization.

61877240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540 (or 536 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 61877240 is about 7866.2087437342. The cubic root of 61877240 is about 395.5277675261.

The spelling of 61877240 in words is "sixty-one million, eight hundred seventy-seven thousand, two hundred forty".