61658 has 4 divisors (see below), whose sum is σ = 92490. Its totient is φ = 30828.

The previous prime is 61657. The next prime is 61667. The reversal of 61658 is 85616.

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

It can be written as a sum of positive squares in only one way, i.e., 41209 + 20449 = 203^2 + 143^2 .

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

It is not an unprimeable number, because it can be changed into a prime (61651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15413 + ... + 15416.

2⁶¹⁶⁵⁸ is an apocalyptic number.

61658 is a deficient number, since it is larger than the sum of its proper divisors (30832).

61658 is a wasteful number, since it uses less digits than its factorization.

61658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30831.

The product of its digits is 1440, while the sum is 26.

The square root of 61658 is about 248.3102897586. The cubic root of 61658 is about 39.5060077387.

The spelling of 61658 in words is "sixty-one thousand, six hundred fifty-eight".