621672025 has 24 divisors (see below), whose sum is σ = 833896280. Its totient is φ = 457021440.

The previous prime is 621672011. The next prime is 621672059. The reversal of 621672025 is 520276126.

It can be written as a sum of positive squares in 12 ways, for example, as 89170249 + 532501776 = 9443^2 + 23076^2 .

It is not a de Polignac number, because 621672025 - 2²¹ = 619574873 is a prime.

It is a super-2 number, since 2×621672025² = 772952213335201250, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70249 + ... + 78601.

Almost surely, 2^621672025 is an apocalyptic number.

621672025 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

621672025 is a deficient number, since it is larger than the sum of its proper divisors (212224255).

621672025 is a wasteful number, since it uses less digits than its factorization.

621672025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8605 (or 8600 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 621672025 is about 24933.3516599754. The cubic root of 621672025 is about 853.4677365847.

The spelling of 621672025 in words is "six hundred twenty-one million, six hundred seventy-two thousand, twenty-five".