77307993 has 32 divisors (see below), whose sum is σ = 138597120. Its totient is φ = 41575680.

The previous prime is 77307983. The next prime is 77308003. The reversal of 77307993 is 39970377.

It is an interprime number because it is at equal distance from previous prime (77307983) and next prime (77308003).

It is not a de Polignac number, because 77307993 - 2⁶ = 77307929 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (77307983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8818 + ... + 15243.

It is an arithmetic number, because the mean of its divisors is an integer number (4331160).

Almost surely, 2^77307993 is an apocalyptic number.

It is an amenable number.

77307993 is a deficient number, since it is larger than the sum of its proper divisors (61289127).

77307993 is a wasteful number, since it uses less digits than its factorization.

77307993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24094 (or 24088 counting only the distinct ones).

The product of its (nonzero) digits is 250047, while the sum is 45.

The square root of 77307993 is about 8792.4964031838. The cubic root of 77307993 is about 425.9985617884.

The spelling of 77307993 in words is "seventy-seven million, three hundred seven thousand, nine hundred ninety-three".