77491907 has 2 divisors, whose sum is σ = 77491908. Its totient is φ = 77491906.

The previous prime is 77491901. The next prime is 77491913. The reversal of 77491907 is 70919477.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (77491901) and next prime (77491913).

It is a cyclic number.

It is not a de Polignac number, because 77491907 - 2¹⁰ = 77490883 is a prime.

It is not a weakly prime, because it can be changed into another prime (77491901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38745953 + 38745954.

It is an arithmetic number, because the mean of its divisors is an integer number (38745954).

Almost surely, 2^77491907 is an apocalyptic number.

77491907 is a deficient number, since it is larger than the sum of its proper divisors (1).

77491907 is an equidigital number, since it uses as much as digits as its factorization.

77491907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 111132, while the sum is 44.

The square root of 77491907 is about 8802.9487673166. The cubic root of 77491907 is about 426.3361079669.

The spelling of 77491907 in words is "seventy-seven million, four hundred ninety-one thousand, nine hundred seven".