61887744 has 54 divisors (see below), whose sum is σ = 178444266. Its totient is φ = 20628480.

The previous prime is 61887743. The next prime is 61887751. The reversal of 61887744 is 44778816.

It can be written as a sum of positive squares in only one way, i.e., 36000000 + 25887744 = 6000^2 + 5088^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 61887744.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61887743) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11127 + ... + 15734.

Almost surely, 2^61887744 is an apocalyptic number.

61887744 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

61887744 is an abundant number, since it is smaller than the sum of its proper divisors (116556522).

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

61887744 is a wasteful number, since it uses less digits than its factorization.

61887744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26883 (or 26866 counting only the distinct ones).

The product of its digits is 301056, while the sum is 45.

The square root of 61887744 is about 7866.8763813854. The cubic root of 61887744 is about 395.5501472606.

The spelling of 61887744 in words is "sixty-one million, eight hundred eighty-seven thousand, seven hundred forty-four".