72173146 has 16 divisors (see below), whose sum is σ = 112020480. Its totient is φ = 34838640.

The previous prime is 72173131. The next prime is 72173147. The reversal of 72173146 is 64137127.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (72173147) 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, 30415 + ... + 32701.

It is an arithmetic number, because the mean of its divisors is an integer number (7001280).

Almost surely, 2^72173146 is an apocalyptic number.

72173146 is a deficient number, since it is larger than the sum of its proper divisors (39847334).

72173146 is a wasteful number, since it uses less digits than its factorization.

72173146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2829.

The product of its digits is 7056, while the sum is 31.

The square root of 72173146 is about 8495.4779736045. The cubic root of 72173146 is about 416.3499774578.

The spelling of 72173146 in words is "seventy-two million, one hundred seventy-three thousand, one hundred forty-six".