89720405 has 8 divisors (see below), whose sum is σ = 107820600. Its totient is φ = 71672256.

The previous prime is 89720399. The next prime is 89720419. The reversal of 89720405 is 50402798.

It is a happy number.

89720405 is nontrivially palindromic in base 4.

It can be written as a sum of positive squares in 4 ways, for example, as 2540836 + 87179569 = 1594^2 + 9337^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-89720405 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9110 + ... + 16199.

It is an arithmetic number, because the mean of its divisors is an integer number (13477575).

Almost surely, 2^89720405 is an apocalyptic number.

It is an amenable number.

89720405 is a deficient number, since it is larger than the sum of its proper divisors (18100195).

89720405 is a wasteful number, since it uses less digits than its factorization.

89720405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26023.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 89720405 is about 9472.0855676034. The cubic root of 89720405 is about 447.6759272077.

The spelling of 89720405 in words is "eighty-nine million, seven hundred twenty thousand, four hundred five".