72839477 has 4 divisors (see below), whose sum is σ = 72875820. Its totient is φ = 72803136.

The previous prime is 72839443. The next prime is 72839479. The reversal of 72839477 is 77493827.

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

It can be written as a sum of positive squares in 2 ways, for example, as 42523441 + 30316036 = 6521^2 + 5506^2 .

It is a cyclic number.

It is not a de Polignac number, because 72839477 - 2¹² = 72835381 is a prime.

It is a super-3 number, since 3×72839477³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72839479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14978 + ... + 19235.

It is an arithmetic number, because the mean of its divisors is an integer number (18218955).

Almost surely, 2^72839477 is an apocalyptic number.

It is an amenable number.

72839477 is a deficient number, since it is larger than the sum of its proper divisors (36343).

72839477 is a wasteful number, since it uses less digits than its factorization.

72839477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36342.

The product of its digits is 592704, while the sum is 47.

The square root of 72839477 is about 8534.6046774294. The cubic root of 72839477 is about 417.6273568937.

The spelling of 72839477 in words is "seventy-two million, eight hundred thirty-nine thousand, four hundred seventy-seven".