61978 has 16 divisors (see below), whose sum is σ = 112320. Its totient is φ = 25056.

The previous prime is 61967. The next prime is 61979. The reversal of 61978 is 87916.

61978 is nontrivially palindromic in base 11.

61978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150 + ... + 382.

It is an arithmetic number, because the mean of its divisors is an integer number (7020).

2⁶¹⁹⁷⁸ is an apocalyptic number.

61978 is a deficient number, since it is larger than the sum of its proper divisors (50342).

61978 is a wasteful number, since it uses less digits than its factorization.

61978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261.

The product of its digits is 3024, while the sum is 31.

The square root of 61978 is about 248.9538109771. The cubic root of 61978 is about 39.5742341658.

The spelling of 61978 in words is "sixty-one thousand, nine hundred seventy-eight".