7663999 has 8 divisors (see below), whose sum is σ = 8837280. Its totient is φ = 6510336.

The previous prime is 7663993. The next prime is 7664009. The reversal of 7663999 is 9993667.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7663999 - 2⁵ = 7663967 is a prime.

It is an Ulam number.

It is a Duffinian number.

7663999 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7663993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4054 + ... + 5635.

It is an arithmetic number, because the mean of its divisors is an integer number (1104660).

Almost surely, 2^7663999 is an apocalyptic number.

7663999 is a deficient number, since it is larger than the sum of its proper divisors (1173281).

7663999 is a wasteful number, since it uses less digits than its factorization.

7663999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9809.

The product of its digits is 551124, while the sum is 49.

The square root of 7663999 is about 2768.3928550695. The cubic root of 7663999 is about 197.1598503320.

The spelling of 7663999 in words is "seven million, six hundred sixty-three thousand, nine hundred ninety-nine".