77870661770 has 32 divisors (see below), whose sum is σ = 153763945920. Its totient is φ = 28158403840.

The previous prime is 77870661749. The next prime is 77870661779. The reversal of 77870661770 is 7716607877.

It is not an unprimeable number, because it can be changed into a prime (77870661779) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1957727 + ... + 1997106.

It is an arithmetic number, because the mean of its divisors is an integer number (4805123310).

Almost surely, 2^77870661770 is an apocalyptic number.

77870661770 is a deficient number, since it is larger than the sum of its proper divisors (75893284150).

77870661770 is a wasteful number, since it uses less digits than its factorization.

77870661770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3955030.

The product of its (nonzero) digits is 4840416, while the sum is 56.

The spelling of 77870661770 in words is "seventy-seven billion, eight hundred seventy million, six hundred sixty-one thousand, seven hundred seventy".