61698 has 32 divisors (see below), whose sum is σ = 153216. Its totient is φ = 16128.

The previous prime is 61687. The next prime is 61703. The reversal of 61698 is 89616.

It is an Ulam number.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a nialpdrome in base 13.

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, 490 + ... + 602.

It is an arithmetic number, because the mean of its divisors is an integer number (4788).

2⁶¹⁶⁹⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61698, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76608).

61698 is an abundant number, since it is smaller than the sum of its proper divisors (91518).

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

61698 is a wasteful number, since it uses less digits than its factorization.

61698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138.

The product of its digits is 2592, while the sum is 30.

The square root of 61698 is about 248.3908210864. The cubic root of 61698 is about 39.5145489321.

The spelling of 61698 in words is "sixty-one thousand, six hundred ninety-eight".