61978045 has 8 divisors (see below), whose sum is σ = 74430720. Its totient is φ = 49544400.

The previous prime is 61978027. The next prime is 61978051. The reversal of 61978045 is 54087916.

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

It is not a de Polignac number, because 61978045 - 2¹⁹ = 61453757 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61977989 and 61978007.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3820 + ... + 11770.

It is an arithmetic number, because the mean of its divisors is an integer number (9303840).

Almost surely, 2^61978045 is an apocalyptic number.

It is an amenable number.

61978045 is a deficient number, since it is larger than the sum of its proper divisors (12452675).

61978045 is a wasteful number, since it uses less digits than its factorization.

61978045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9515.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 61978045 is about 7872.6136066747. The cubic root of 61978045 is about 395.7424374362.

The spelling of 61978045 in words is "sixty-one million, nine hundred seventy-eight thousand, forty-five".