74679991 has 2 divisors, whose sum is σ = 74679992. Its totient is φ = 74679990.

The previous prime is 74679973. The next prime is 74680007. The reversal of 74679991 is 19997647.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 74679991 - 2¹¹ = 74677943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74679931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37339995 + 37339996.

It is an arithmetic number, because the mean of its divisors is an integer number (37339996).

Almost surely, 2^74679991 is an apocalyptic number.

74679991 is a deficient number, since it is larger than the sum of its proper divisors (1).

74679991 is an equidigital number, since it uses as much as digits as its factorization.

74679991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 857304, while the sum is 52.

The square root of 74679991 is about 8641.7585594600. The cubic root of 74679991 is about 421.1156863542.

The spelling of 74679991 in words is "seventy-four million, six hundred seventy-nine thousand, nine hundred ninety-one".