72843077 has 4 divisors (see below), whose sum is σ = 73487820. Its totient is φ = 72198336.

The previous prime is 72843073. The next prime is 72843083. The reversal of 72843077 is 77034827.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7540516 + 65302561 = 2746^2 + 8081^2 .

It is a cyclic number.

It is not a de Polignac number, because 72843077 - 2² = 72843073 is a prime.

It is a super-2 number, since 2×72843077² = 10612227733655858, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72843077.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72843073) 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, 322202 + ... + 322427.

It is an arithmetic number, because the mean of its divisors is an integer number (18371955).

Almost surely, 2^72843077 is an apocalyptic number.

It is an amenable number.

72843077 is a deficient number, since it is larger than the sum of its proper divisors (644743).

72843077 is a wasteful number, since it uses less digits than its factorization.

72843077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644742.

The product of its (nonzero) digits is 65856, while the sum is 38.

The square root of 72843077 is about 8534.8155809016. The cubic root of 72843077 is about 417.6342370169.

The spelling of 72843077 in words is "seventy-two million, eight hundred forty-three thousand, seventy-seven".