2621542690 has 16 divisors (see below), whose sum is σ = 5081759928. Its totient is φ = 967954176.

The previous prime is 2621542607. The next prime is 2621542699. The reversal of 2621542690 is 962451262.

It can be written as a sum of positive squares in 4 ways, for example, as 1945074609 + 676468081 = 44103^2 + 26009^2 .

It is a super-2 number, since 2×2621542690² = 13744972150984872200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2621542699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10082727 + ... + 10082986.

Almost surely, 2^2621542690 is an apocalyptic number.

2621542690 is a deficient number, since it is larger than the sum of its proper divisors (2460217238).

2621542690 is a wasteful number, since it uses less digits than its factorization.

2621542690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20165733.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 2621542690 is about 51201.0028222104. The cubic root of 2621542690 is about 1378.8562058530.

The spelling of 2621542690 in words is "two billion, six hundred twenty-one million, five hundred forty-two thousand, six hundred ninety".