72638089 has 4 divisors (see below), whose sum is σ = 73357380. Its totient is φ = 71918800.

The previous prime is 72638087. The next prime is 72638107. The reversal of 72638089 is 98083627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98083627 = 389 ⋅252143.

It can be written as a sum of positive squares in 2 ways, for example, as 36542025 + 36096064 = 6045^2 + 6008^2 .

It is a cyclic number.

It is not a de Polignac number, because 72638089 - 2¹ = 72638087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72638087) 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, 359494 + ... + 359695.

It is an arithmetic number, because the mean of its divisors is an integer number (18339345).

Almost surely, 2^72638089 is an apocalyptic number.

It is an amenable number.

72638089 is a deficient number, since it is larger than the sum of its proper divisors (719291).

72638089 is a wasteful number, since it uses less digits than its factorization.

72638089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719290.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 72638089 is about 8522.7981907352. The cubic root of 72638089 is about 417.2421135580.

The spelling of 72638089 in words is "seventy-two million, six hundred thirty-eight thousand, eighty-nine".