71921015 has 8 divisors (see below), whose sum is σ = 89281440. Its totient is φ = 55552672.

The previous prime is 71920993. The next prime is 71921039. The reversal of 71921015 is 51012917.

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 71921015 - 2⁸ = 71920759 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 247859 + ... + 248148.

It is an arithmetic number, because the mean of its divisors is an integer number (11160180).

Almost surely, 2^71921015 is an apocalyptic number.

71921015 is a deficient number, since it is larger than the sum of its proper divisors (17360425).

71921015 is a wasteful number, since it uses less digits than its factorization.

71921015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496041.

The product of its (nonzero) digits is 630, while the sum is 26.

The square root of 71921015 is about 8480.6258613383. The cubic root of 71921015 is about 415.8645835590.

The spelling of 71921015 in words is "seventy-one million, nine hundred twenty-one thousand, fifteen".