73213257 has 16 divisors (see below), whose sum is σ = 105300608. Its totient is φ = 44979840.

The previous prime is 73213253. The next prime is 73213267. The reversal of 73213257 is 75231237.

It is not a de Polignac number, because 73213257 - 2² = 73213253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73213253) 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, 30957 + ... + 33237.

It is an arithmetic number, because the mean of its divisors is an integer number (6581288).

Almost surely, 2^73213257 is an apocalyptic number.

It is an amenable number.

73213257 is a deficient number, since it is larger than the sum of its proper divisors (32087351).

73213257 is a wasteful number, since it uses less digits than its factorization.

73213257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3120.

The product of its digits is 8820, while the sum is 30.

The square root of 73213257 is about 8556.4745660815. The cubic root of 73213257 is about 418.3404981057.

The spelling of 73213257 in words is "seventy-three million, two hundred thirteen thousand, two hundred fifty-seven".