61978956 has 24 divisors (see below), whose sum is σ = 155742384. Its totient is φ = 19070400.

The previous prime is 61978933. The next prime is 61978963. The reversal of 61978956 is 65987916.

It is a junction number, because it is equal to n+sod(n) for n = 61978899 and 61978908.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198495 + ... + 198806.

It is an arithmetic number, because the mean of its divisors is an integer number (6489266).

Almost surely, 2^61978956 is an apocalyptic number.

It is an amenable number.

61978956 is an abundant number, since it is smaller than the sum of its proper divisors (93763428).

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

61978956 is a wasteful number, since it uses less digits than its factorization.

61978956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397321 (or 397319 counting only the distinct ones).

The product of its digits is 816480, while the sum is 51.

The square root of 61978956 is about 7872.6714652651. The cubic root of 61978956 is about 395.7443764002.

The spelling of 61978956 in words is "sixty-one million, nine hundred seventy-eight thousand, nine hundred fifty-six".