72803421 has 16 divisors (see below), whose sum is σ = 113534400. Its totient is φ = 45980784.

The previous prime is 72803377. The next prime is 72803431. The reversal of 72803421 is 12430827.

It is not a de Polignac number, because 72803421 - 2⁷ = 72803293 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72803431) 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, 70446 + ... + 71471.

It is an arithmetic number, because the mean of its divisors is an integer number (7095900).

Almost surely, 2^72803421 is an apocalyptic number.

It is an amenable number.

72803421 is a deficient number, since it is larger than the sum of its proper divisors (40730979).

72803421 is a wasteful number, since it uses less digits than its factorization.

72803421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141945 (or 141939 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 72803421 is about 8532.4920744176. The cubic root of 72803421 is about 417.5584361295.

It can be divided in two parts, 7280 and 3421, that added together give a palindrome (10701).

The spelling of 72803421 in words is "seventy-two million, eight hundred three thousand, four hundred twenty-one".