77891492 has 24 divisors (see below), whose sum is σ = 156663360. Its totient is φ = 33193440.

The previous prime is 77891491. The next prime is 77891497. The reversal of 77891492 is 29419877.

It is not an unprimeable number, because it can be changed into a prime (77891491) 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 7 ways as a sum of consecutive naturals, for example, 2759 + ... + 12782.

It is an arithmetic number, because the mean of its divisors is an integer number (6527640).

Almost surely, 2^77891492 is an apocalyptic number.

It is an amenable number.

77891492 is an abundant number, since it is smaller than the sum of its proper divisors (78771868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77891492 is a wasteful number, since it uses less digits than its factorization.

77891492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15731 (or 15729 counting only the distinct ones).

The product of its digits is 254016, while the sum is 47.

The square root of 77891492 is about 8825.6156725749. The cubic root of 77891492 is about 427.0676490252.

The spelling of 77891492 in words is "seventy-seven million, eight hundred ninety-one thousand, four hundred ninety-two".