621672071 has 4 divisors (see below), whose sum is σ = 621723144. Its totient is φ = 621621000.

The previous prime is 621672059. The next prime is 621672097. The reversal of 621672071 is 170276126.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 621672071 - 2¹⁸ = 621409927 is a prime.

It is a super-2 number, since 2×621672071² = 772952327722858082, 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 (621672011) 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, 4496 + ... + 35546.

It is an arithmetic number, because the mean of its divisors is an integer number (155430786).

Almost surely, 2^621672071 is an apocalyptic number.

621672071 is a deficient number, since it is larger than the sum of its proper divisors (51073).

621672071 is a wasteful number, since it uses less digits than its factorization.

621672071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51072.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 621672071 is about 24933.3525824346. The cubic root of 621672071 is about 853.4677576352.

It can be divided in two parts, 6216 and 72071, that added together give a palindrome (78287).

The spelling of 621672071 in words is "six hundred twenty-one million, six hundred seventy-two thousand, seventy-one".