61688055 has 32 divisors (see below), whose sum is σ = 115960320. Its totient is φ = 27607680.

The previous prime is 61688027. The next prime is 61688059. The reversal of 61688055 is 55088616.

It is not a de Polignac number, because 61688055 - 2²¹ = 59590903 is a prime.

It is a super-2 number, since 2×61688055² = 7610832259366050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61688059) 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, 12235 + ... + 16524.

It is an arithmetic number, because the mean of its divisors is an integer number (3623760).

Almost surely, 2^61688055 is an apocalyptic number.

61688055 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

61688055 is a deficient number, since it is larger than the sum of its proper divisors (54272265).

61688055 is a wasteful number, since it uses less digits than its factorization.

61688055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28791.

The product of its (nonzero) digits is 57600, while the sum is 39.

The square root of 61688055 is about 7854.1743678123. The cubic root of 61688055 is about 395.1242572277.

The spelling of 61688055 in words is "sixty-one million, six hundred eighty-eight thousand, fifty-five".