82620397 has 4 divisors (see below), whose sum is σ = 82647040. Its totient is φ = 82593756.

The previous prime is 82620389. The next prime is 82620401. The reversal of 82620397 is 79302628.

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.

It is a cyclic number.

It is not a de Polignac number, because 82620397 - 2³ = 82620389 is a prime.

It is a super-2 number, since 2×82620397² = 13652260000875218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82620997) 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, 7947 + ... + 15112.

It is an arithmetic number, because the mean of its divisors is an integer number (20661760).

Almost surely, 2^82620397 is an apocalyptic number.

It is an amenable number.

82620397 is a deficient number, since it is larger than the sum of its proper divisors (26643).

82620397 is a wasteful number, since it uses less digits than its factorization.

82620397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26642.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 82620397 is about 9089.5762827538. The cubic root of 82620397 is about 435.5410487059.

The spelling of 82620397 in words is "eighty-two million, six hundred twenty thousand, three hundred ninety-seven".