72421867 has 8 divisors (see below), whose sum is σ = 84786912. Its totient is φ = 60561600.

The previous prime is 72421861. The next prime is 72421873. The reversal of 72421867 is 76812427.

It is an interprime number because it is at equal distance from previous prime (72421861) and next prime (72421873).

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-72421867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72421861) 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, 125884 + ... + 126457.

It is an arithmetic number, because the mean of its divisors is an integer number (10598364).

Almost surely, 2^72421867 is an apocalyptic number.

72421867 is a deficient number, since it is larger than the sum of its proper divisors (12365045).

72421867 is a wasteful number, since it uses less digits than its factorization.

72421867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252389.

The product of its digits is 37632, while the sum is 37.

The square root of 72421867 is about 8510.1038184032. The cubic root of 72421867 is about 416.8277001735.

The spelling of 72421867 in words is "seventy-two million, four hundred twenty-one thousand, eight hundred sixty-seven".