72842643 has 6 divisors (see below), whose sum is σ = 105217164. Its totient is φ = 48561756.

The previous prime is 72842641. The next prime is 72842647. The reversal of 72842643 is 34624827.

72842643 is a `hidden beast` number, since 7 + 2 + 8 + 4 + 2 + 643 = 666.

It is not a de Polignac number, because 72842643 - 2¹ = 72842641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72842598 and 72842607.

It is not an unprimeable number, because it can be changed into a prime (72842641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4046805 + ... + 4046822.

It is an arithmetic number, because the mean of its divisors is an integer number (17536194).

Almost surely, 2^72842643 is an apocalyptic number.

72842643 is a deficient number, since it is larger than the sum of its proper divisors (32374521).

72842643 is a wasteful number, since it uses less digits than its factorization.

72842643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8093633 (or 8093630 counting only the distinct ones).

The product of its digits is 64512, while the sum is 36.

The square root of 72842643 is about 8534.7901555926. The cubic root of 72842643 is about 417.6334075918.

The spelling of 72842643 in words is "seventy-two million, eight hundred forty-two thousand, six hundred forty-three".