73000018 has 32 divisors (see below), whose sum is σ = 139426560. Its totient is φ = 27881280.

The previous prime is 73000013. The next prime is 73000019. The reversal of 73000018 is 81000037.

It is a junction number, because it is equal to n+sod(n) for n = 72999959 and 73000004.

It is not an unprimeable number, because it can be changed into a prime (73000013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1638 + ... + 12193.

It is an arithmetic number, because the mean of its divisors is an integer number (4357080).

Almost surely, 2^73000018 is an apocalyptic number.

73000018 is a deficient number, since it is larger than the sum of its proper divisors (66426542).

73000018 is a wasteful number, since it uses less digits than its factorization.

73000018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13882.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 73000018 is about 8544.0047986878. The cubic root of 73000018 is about 417.9339539889.

Adding to 73000018 its sum of digits (19), we get a palindrome (73000037).

It can be divided in two parts, 7 and 3000018, that added together give a triangular number (3000025 = T₂₄₄₉).

The spelling of 73000018 in words is "seventy-three million, eighteen", and thus it is an aban number and an uban number.