621712457 has 8 divisors (see below), whose sum is σ = 667302696. Its totient is φ = 577124352.

The previous prime is 621712393. The next prime is 621712459. The reversal of 621712457 is 754217126.

It can be written as a sum of positive squares in 4 ways, for example, as 102738496 + 518973961 = 10136^2 + 22781^2 .

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 621712457 - 2⁶ = 621712393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621712459) 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, 249248 + ... + 251729.

It is an arithmetic number, because the mean of its divisors is an integer number (83412837).

Almost surely, 2^621712457 is an apocalyptic number.

It is an amenable number.

621712457 is a deficient number, since it is larger than the sum of its proper divisors (45590239).

621712457 is a wasteful number, since it uses less digits than its factorization.

621712457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501067.

The product of its digits is 23520, while the sum is 35.

The square root of 621712457 is about 24934.1624483358. The cubic root of 621712457 is about 853.4862386555.

The spelling of 621712457 in words is "six hundred twenty-one million, seven hundred twelve thousand, four hundred fifty-seven".