76638921 has 8 divisors (see below), whose sum is σ = 106628160. Its totient is φ = 48871152.

The previous prime is 76638911. The next prime is 76638923. The reversal of 76638921 is 12983667.

It is a happy number.

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

It is not a de Polignac number, because 76638921 - 2⁵ = 76638889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (76638923) 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, 555286 + ... + 555423.

It is an arithmetic number, because the mean of its divisors is an integer number (13328520).

Almost surely, 2^76638921 is an apocalyptic number.

It is an amenable number.

76638921 is a deficient number, since it is larger than the sum of its proper divisors (29989239).

76638921 is a wasteful number, since it uses less digits than its factorization.

76638921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110735.

The product of its digits is 108864, while the sum is 42.

The square root of 76638921 is about 8754.3658251183. The cubic root of 76638921 is about 424.7660460926.

The spelling of 76638921 in words is "seventy-six million, six hundred thirty-eight thousand, nine hundred twenty-one".