61077440 has 112 divisors (see below), whose sum is σ = 154497024. Its totient is φ = 22963200.

The previous prime is 61077439. The next prime is 61077461. The reversal of 61077440 is 4477016.

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 15 ways as a sum of consecutive naturals, for example, 466175 + ... + 466305.

Almost surely, 2^61077440 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 61077440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77248512).

61077440 is an abundant number, since it is smaller than the sum of its proper divisors (93419584).

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

61077440 is a wasteful number, since it uses less digits than its factorization.

61077440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226 (or 216 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 61077440 is about 7815.2056914710. The cubic root of 61077440 is about 393.8162283828.

The spelling of 61077440 in words is "sixty-one million, seventy-seven thousand, four hundred forty".