72028969 has 4 divisors (see below), whose sum is σ = 72067840. Its totient is φ = 71990100.

The previous prime is 72028933. The next prime is 72028987. The reversal of 72028969 is 96982027.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96982027 = 7643 ⋅12689.

It is a cyclic number.

It is not a de Polignac number, because 72028969 - 2⁹ = 72028457 is a prime.

It is a super-2 number, since 2×72028969² = 10376344750405922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72028919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16509 + ... + 20410.

It is an arithmetic number, because the mean of its divisors is an integer number (18016960).

Almost surely, 2^72028969 is an apocalyptic number.

It is an amenable number.

72028969 is a deficient number, since it is larger than the sum of its proper divisors (38871).

72028969 is a wasteful number, since it uses less digits than its factorization.

72028969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38870.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 72028969 is about 8486.9882172653. The cubic root of 72028969 is about 416.0725515257.

The spelling of 72028969 in words is "seventy-two million, twenty-eight thousand, nine hundred sixty-nine".