72821897 has 8 divisors (see below), whose sum is σ = 77217696. Its totient is φ = 68438592.

The previous prime is 72821873. The next prime is 72821899. The reversal of 72821897 is 79812827.

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 72821897 - 2²² = 68627593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72821899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10658 + ... + 16100.

It is an arithmetic number, because the mean of its divisors is an integer number (9652212).

Almost surely, 2^72821897 is an apocalyptic number.

It is an amenable number.

72821897 is a deficient number, since it is larger than the sum of its proper divisors (4395799).

72821897 is a wasteful number, since it uses less digits than its factorization.

72821897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6247.

The product of its digits is 112896, while the sum is 44.

The square root of 72821897 is about 8533.5746905971. The cubic root of 72821897 is about 417.5937557021.

The spelling of 72821897 in words is "seventy-two million, eight hundred twenty-one thousand, eight hundred ninety-seven".