89378721 has 20 divisors (see below), whose sum is σ = 133884564. Its totient is φ = 59421600.

The previous prime is 89378711. The next prime is 89378743. The reversal of 89378721 is 12787398.

It can be written as a sum of positive squares in 2 ways, for example, as 28772496 + 60606225 = 5364^2 + 7785^2 .

It is not a de Polignac number, because 89378721 - 2⁶ = 89378657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (89378701) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 32791 + ... + 35411.

Almost surely, 2^89378721 is an apocalyptic number.

89378721 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

89378721 is a deficient number, since it is larger than the sum of its proper divisors (44505843).

89378721 is a wasteful number, since it uses less digits than its factorization.

89378721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3054 (or 3045 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 89378721 is about 9454.0319969841. The cubic root of 89378721 is about 447.1069065499.

The spelling of 89378721 in words is "eighty-nine million, three hundred seventy-eight thousand, seven hundred twenty-one".