87721379 has 8 divisors (see below), whose sum is σ = 91629312. Its totient is φ = 83821320.

The previous prime is 87721367. The next prime is 87721391. The reversal of 87721379 is 97312778.

It is an interprime number because it is at equal distance from previous prime (87721367) and next prime (87721391).

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

It is a cyclic number.

It is not a de Polignac number, because 87721379 - 2¹² = 87717283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87721079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41072 + ... + 43154.

It is an arithmetic number, because the mean of its divisors is an integer number (11453664).

Almost surely, 2^87721379 is an apocalyptic number.

87721379 is a deficient number, since it is larger than the sum of its proper divisors (3907933).

87721379 is a wasteful number, since it uses less digits than its factorization.

87721379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3937.

The product of its digits is 148176, while the sum is 44.

The square root of 87721379 is about 9365.9691970452. The cubic root of 87721379 is about 444.3260918451.

The spelling of 87721379 in words is "eighty-seven million, seven hundred twenty-one thousand, three hundred seventy-nine".