71628493 has 8 divisors (see below), whose sum is σ = 73708056. Its totient is φ = 69576000.

The previous prime is 71628481. The next prime is 71628503. The reversal of 71628493 is 39482617.

It can be written as a sum of positive squares in 4 ways, for example, as 21883684 + 49744809 = 4678^2 + 7053^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71628493 - 2¹³ = 71620301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71628413) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1338 + ... + 12043.

It is an arithmetic number, because the mean of its divisors is an integer number (9213507).

Almost surely, 2^71628493 is an apocalyptic number.

71628493 is the 5353-rd heptagonal number.

It is an amenable number.

71628493 is a deficient number, since it is larger than the sum of its proper divisors (2079563).

71628493 is a wasteful number, since it uses less digits than its factorization.

71628493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13535.

The product of its digits is 72576, while the sum is 40.

The square root of 71628493 is about 8463.3618024991. The cubic root of 71628493 is about 415.3000066155.

The spelling of 71628493 in words is "seventy-one million, six hundred twenty-eight thousand, four hundred ninety-three".