61889555 has 32 divisors (see below), whose sum is σ = 96230400. Its totient is φ = 37107072.

The previous prime is 61889551. The next prime is 61889587. The reversal of 61889555 is 55598816.

It is a cyclic number.

It is not a de Polignac number, because 61889555 - 2² = 61889551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61889551) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5066 + ... + 12224.

It is an arithmetic number, because the mean of its divisors is an integer number (3007200).

Almost surely, 2^61889555 is an apocalyptic number.

61889555 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

61889555 is a deficient number, since it is larger than the sum of its proper divisors (34340845).

61889555 is a wasteful number, since it uses less digits than its factorization.

61889555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7203.

The product of its digits is 432000, while the sum is 47.

The square root of 61889555 is about 7866.9914834071. The cubic root of 61889555 is about 395.5540055061.

The spelling of 61889555 in words is "sixty-one million, eight hundred eighty-nine thousand, five hundred fifty-five".