77419891 has 4 divisors (see below), whose sum is σ = 78510384. Its totient is φ = 76329400.

The previous prime is 77419883. The next prime is 77419897. The reversal of 77419891 is 19891477.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77419891 - 2³ = 77419883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77419897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 545140 + ... + 545281.

It is an arithmetic number, because the mean of its divisors is an integer number (19627596).

Almost surely, 2^77419891 is an apocalyptic number.

77419891 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

77419891 is a deficient number, since it is larger than the sum of its proper divisors (1090493).

77419891 is a wasteful number, since it uses less digits than its factorization.

77419891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090492.

The product of its digits is 127008, while the sum is 46.

The square root of 77419891 is about 8798.8573689997. The cubic root of 77419891 is about 426.2039972369.

The spelling of 77419891 in words is "seventy-seven million, four hundred nineteen thousand, eight hundred ninety-one".