65620399 has 8 divisors (see below), whose sum is σ = 70747040. Its totient is φ = 60505056.

The previous prime is 65620393. The next prime is 65620421. The reversal of 65620399 is 99302656.

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 65620399 - 2⁷ = 65620271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65620393) 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, 12262 + ... + 16780.

It is an arithmetic number, because the mean of its divisors is an integer number (8843380).

Almost surely, 2^65620399 is an apocalyptic number.

65620399 is a deficient number, since it is larger than the sum of its proper divisors (5126641).

65620399 is a wasteful number, since it uses less digits than its factorization.

65620399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5649.

The product of its (nonzero) digits is 87480, while the sum is 40.

The square root of 65620399 is about 8100.6418881469. The cubic root of 65620399 is about 403.3477347649.

The spelling of 65620399 in words is "sixty-five million, six hundred twenty thousand, three hundred ninety-nine".