61287055 has 4 divisors (see below), whose sum is σ = 73544472. Its totient is φ = 49029640.

The previous prime is 61287053. The next prime is 61287071. The reversal of 61287055 is 55078216.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 61287055 - 2¹ = 61287053 is a prime.

It is a super-2 number, since 2×61287055² = 7512206221146050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61287055.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61287053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6128701 + ... + 6128710.

It is an arithmetic number, because the mean of its divisors is an integer number (18386118).

Almost surely, 2^61287055 is an apocalyptic number.

61287055 is a deficient number, since it is larger than the sum of its proper divisors (12257417).

61287055 is a wasteful number, since it uses less digits than its factorization.

61287055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12257416.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 61287055 is about 7828.6049204185. The cubic root of 61287055 is about 394.2662337784.

The spelling of 61287055 in words is "sixty-one million, two hundred eighty-seven thousand, fifty-five".