76438891 has 4 divisors (see below), whose sum is σ = 76573800. Its totient is φ = 76303984.

The previous prime is 76438877. The next prime is 76438897. The reversal of 76438891 is 19883467.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 76438891 - 2¹³ = 76430699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76438897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66601 + ... + 67738.

It is an arithmetic number, because the mean of its divisors is an integer number (19143450).

Almost surely, 2^76438891 is an apocalyptic number.

76438891 is a deficient number, since it is larger than the sum of its proper divisors (134909).

76438891 is a wasteful number, since it uses less digits than its factorization.

76438891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134908.

The product of its digits is 290304, while the sum is 46.

The square root of 76438891 is about 8742.9337753411. The cubic root of 76438891 is about 424.3961731884.

The spelling of 76438891 in words is "seventy-six million, four hundred thirty-eight thousand, eight hundred ninety-one".