72943898 has 4 divisors (see below), whose sum is σ = 109415850. Its totient is φ = 36471948.

The previous prime is 72943891. The next prime is 72943901. The reversal of 72943898 is 89834927.

It is a happy number.

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., 71182969 + 1760929 = 8437^2 + 1327^2 .

It is a super-3 number, since 3×72943898³ (a number of 25 digits) contains 333 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (72943891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18235973 + ... + 18235976.

Almost surely, 2^72943898 is an apocalyptic number.

72943898 is a deficient number, since it is larger than the sum of its proper divisors (36471952).

72943898 is a wasteful number, since it uses less digits than its factorization.

72943898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36471951.

The product of its digits is 870912, while the sum is 50.

The square root of 72943898 is about 8540.7199930685. The cubic root of 72943898 is about 417.8268285979.

The spelling of 72943898 in words is "seventy-two million, nine hundred forty-three thousand, eight hundred ninety-eight".