97628321 has 4 divisors (see below), whose sum is σ = 111575232. Its totient is φ = 83681412.

The previous prime is 97628309. The next prime is 97628347. The reversal of 97628321 is 12382679.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12382679 = 37 ⋅334667.

It is a cyclic number.

It is not a de Polignac number, because 97628321 - 2²² = 93434017 is a prime.

It is a super-2 number, since 2×97628321² = 19062578122558082, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (97628351) 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, 6973445 + ... + 6973458.

It is an arithmetic number, because the mean of its divisors is an integer number (27893808).

Almost surely, 2^97628321 is an apocalyptic number.

It is an amenable number.

97628321 is a deficient number, since it is larger than the sum of its proper divisors (13946911).

97628321 is a wasteful number, since it uses less digits than its factorization.

97628321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13946910.

The product of its digits is 36288, while the sum is 38.

The square root of 97628321 is about 9880.7044789327. The cubic root of 97628321 is about 460.4600328496.

The spelling of 97628321 in words is "ninety-seven million, six hundred twenty-eight thousand, three hundred twenty-one".