72171002 has 4 divisors (see below), whose sum is σ = 108256506. Its totient is φ = 36085500.

The previous prime is 72170977. The next prime is 72171013. The reversal of 72171002 is 20017127.

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

It can be written as a sum of positive squares in only one way, i.e., 66406201 + 5764801 = 8149^2 + 2401^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18042749 + ... + 18042752.

Almost surely, 2^72171002 is an apocalyptic number.

72171002 is a deficient number, since it is larger than the sum of its proper divisors (36085504).

72171002 is a wasteful number, since it uses less digits than its factorization.

72171002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36085503.

The product of its (nonzero) digits is 196, while the sum is 20.

The square root of 72171002 is about 8495.3517878897. The cubic root of 72171002 is about 416.3458546724.

Adding to 72171002 its reverse (20017127), we get a palindrome (92188129).

The spelling of 72171002 in words is "seventy-two million, one hundred seventy-one thousand, two".