61678 has 4 divisors (see below), whose sum is σ = 92520. Its totient is φ = 30838.

The previous prime is 61673. The next prime is 61681. The reversal of 61678 is 87616.

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

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15418 + ... + 15421.

It is an arithmetic number, because the mean of its divisors is an integer number (23130).

2⁶¹⁶⁷⁸ is an apocalyptic number.

61678 is a deficient number, since it is larger than the sum of its proper divisors (30842).

61678 is a wasteful number, since it uses less digits than its factorization.

61678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30841.

The product of its digits is 2016, while the sum is 28.

The square root of 61678 is about 248.3505586867. The cubic root of 61678 is about 39.5102787970.

The spelling of 61678 in words is "sixty-one thousand, six hundred seventy-eight".