61153978 has 8 divisors (see below), whose sum is σ = 91764468. Its totient is φ = 30565824.

The previous prime is 61153973. The next prime is 61153999. The reversal of 61153978 is 87935116.

61153978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 60419529 + 734449 = 7773^2 + 857^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 61153978.

It is not an unprimeable number, because it can be changed into a prime (61153973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6450 + ... + 12802.

Almost surely, 2^61153978 is an apocalyptic number.

61153978 is a deficient number, since it is larger than the sum of its proper divisors (30610490).

61153978 is a wasteful number, since it uses less digits than its factorization.

61153978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11168.

The product of its digits is 45360, while the sum is 40.

The square root of 61153978 is about 7820.1008944898. The cubic root of 61153978 is about 393.9806607529.

The spelling of 61153978 in words is "sixty-one million, one hundred fifty-three thousand, nine hundred seventy-eight".