72646989 has 8 divisors (see below), whose sum is σ = 97101120. Its totient is φ = 48312096.

The previous prime is 72646979. The next prime is 72646997. The reversal of 72646989 is 98964627.

It is a happy number.

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

It is not a de Polignac number, because 72646989 - 2¹² = 72642893 is a prime.

It is a super-2 number, since 2×72646989² = 10555170021532242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72646969) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28377 + ... + 30830.

It is an arithmetic number, because the mean of its divisors is an integer number (12137640).

Almost surely, 2^72646989 is an apocalyptic number.

It is an amenable number.

72646989 is a deficient number, since it is larger than the sum of its proper divisors (24454131).

72646989 is a wasteful number, since it uses less digits than its factorization.

72646989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59619.

The product of its digits is 1306368, while the sum is 51.

The square root of 72646989 is about 8523.3203037314. The cubic root of 72646989 is about 417.2591537601.

The spelling of 72646989 in words is "seventy-two million, six hundred forty-six thousand, nine hundred eighty-nine".