72170740 has 48 divisors (see below), whose sum is σ = 160372800. Its totient is φ = 27205632.

The previous prime is 72170737. The next prime is 72170771. The reversal of 72170740 is 4707127.

It is a junction number, because it is equal to n+sod(n) for n = 72170699 and 72170708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97291 + ... + 98029.

It is an arithmetic number, because the mean of its divisors is an integer number (3341100).

Almost surely, 2^72170740 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 72170740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80186400).

72170740 is an abundant number, since it is smaller than the sum of its proper divisors (88202060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72170740 is a wasteful number, since it uses less digits than its factorization.

72170740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024 (or 1022 counting only the distinct ones).

The product of its (nonzero) digits is 2744, while the sum is 28.

The square root of 72170740 is about 8495.3363676784. The cubic root of 72170740 is about 416.3453508562.

Adding to 72170740 its reverse (4707127), we get a palindrome (76877867).

The spelling of 72170740 in words is "seventy-two million, one hundred seventy thousand, seven hundred forty".