61982978 has 18 divisors (see below), whose sum is σ = 98461449. Its totient is φ = 29260152.

The previous prime is 61982951. The next prime is 61983001. The reversal of 61982978 is 87928916.

It can be written as a sum of positive squares in 2 ways, for example, as 44983849 + 16999129 = 6707^2 + 4123^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=5567.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 211400 + ... + 211692.

Almost surely, 2^61982978 is an apocalyptic number.

61982978 is a deficient number, since it is larger than the sum of its proper divisors (36478471).

61982978 is an equidigital number, since it uses as much as digits as its factorization.

61982978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626 (or 314 counting only the distinct ones).

The product of its digits is 435456, while the sum is 50.

The square root of 61982978 is about 7872.9269017310. The cubic root of 61982978 is about 395.7529365608.

Multiplying 61982978 by its sum of digits (50), we get a square (3099148900 = 55670²).

The spelling of 61982978 in words is "sixty-one million, nine hundred eighty-two thousand, nine hundred seventy-eight".