61877997 has 6 divisors (see below), whose sum is σ = 89379342. Its totient is φ = 41251992.

The previous prime is 61877987. The next prime is 61878001. The reversal of 61877997 is 79977816.

It can be written as a sum of positive squares in only one way, i.e., 54375876 + 7502121 = 7374^2 + 2739^2 .

It is not a de Polignac number, because 61877997 - 2⁷ = 61877869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61877987) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3437658 + ... + 3437675.

It is an arithmetic number, because the mean of its divisors is an integer number (14896557).

Almost surely, 2^61877997 is an apocalyptic number.

It is an amenable number.

61877997 is a deficient number, since it is larger than the sum of its proper divisors (27501345).

61877997 is a wasteful number, since it uses less digits than its factorization.

61877997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6875339 (or 6875336 counting only the distinct ones).

The product of its digits is 1333584, while the sum is 54.

The square root of 61877997 is about 7866.2568607947. The cubic root of 61877997 is about 395.5293804687.

The spelling of 61877997 in words is "sixty-one million, eight hundred seventy-seven thousand, nine hundred ninety-seven".