621689065 has 16 divisors (see below), whose sum is σ = 791043840. Its totient is φ = 467424000.

The previous prime is 621689053. The next prime is 621689093. The reversal of 621689065 is 560986126.

It is not a de Polignac number, because 621689065 - 2⁷ = 621688937 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58966 + ... + 68704.

It is an arithmetic number, because the mean of its divisors is an integer number (49440240).

Almost surely, 2^621689065 is an apocalyptic number.

It is an amenable number.

621689065 is a deficient number, since it is larger than the sum of its proper divisors (169354775).

621689065 is a wasteful number, since it uses less digits than its factorization.

621689065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10512.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 621689065 is about 24933.6933686127. The cubic root of 621689065 is about 853.4755343499.

The spelling of 621689065 in words is "six hundred twenty-one million, six hundred eighty-nine thousand, sixty-five".