61387977 has 16 divisors (see below), whose sum is σ = 94730240. Its totient is φ = 34633872.

The previous prime is 61387957. The next prime is 61387981. The reversal of 61387977 is 77978316.

It is a happy number.

61387977 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61387977 - 2⁶ = 61387913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61387927) 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 15 ways as a sum of consecutive naturals, for example, 16843 + ... + 20160.

It is an arithmetic number, because the mean of its divisors is an integer number (5920640).

Almost surely, 2^61387977 is an apocalyptic number.

It is an amenable number.

61387977 is a deficient number, since it is larger than the sum of its proper divisors (33342263).

61387977 is a wasteful number, since it uses less digits than its factorization.

61387977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37092.

The product of its digits is 444528, while the sum is 48.

The square root of 61387977 is about 7835.0479896424. The cubic root of 61387977 is about 394.4825291329.

The spelling of 61387977 in words is "sixty-one million, three hundred eighty-seven thousand, nine hundred seventy-seven".