82621810 has 8 divisors (see below), whose sum is σ = 148719276. Its totient is φ = 33048720.

The previous prime is 82621807. The next prime is 82621811. The reversal of 82621810 is 1812628.

It can be written as a sum of positive squares in 2 ways, for example, as 76895361 + 5726449 = 8769^2 + 2393^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×82621810² = 13652726975352200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (82621811) 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, 4131081 + ... + 4131100.

Almost surely, 2^82621810 is an apocalyptic number.

82621810 is a deficient number, since it is larger than the sum of its proper divisors (66097466).

82621810 is a wasteful number, since it uses less digits than its factorization.

82621810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8262188.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 82621810 is about 9089.6540088168. The cubic root of 82621810 is about 435.5435316117.

The spelling of 82621810 in words is "eighty-two million, six hundred twenty-one thousand, eight hundred ten".