2620640642 has 16 divisors (see below), whose sum is σ = 4063132800. Its totient is φ = 1266991440.

The previous prime is 2620640611. The next prime is 2620640663. The reversal of 2620640642 is 2460460262.

It is a junction number, because it is equal to n+sod(n) for n = 2620640599 and 2620640608.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174842 + ... + 189237.

It is an arithmetic number, because the mean of its divisors is an integer number (253945800).

Almost surely, 2^2620640642 is an apocalyptic number.

2620640642 is a deficient number, since it is larger than the sum of its proper divisors (1442492158).

2620640642 is a wasteful number, since it uses less digits than its factorization.

2620640642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364201.

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 2620640642 is about 51192.1931743503. The cubic root of 2620640642 is about 1378.6980372583.

The spelling of 2620640642 in words is "two billion, six hundred twenty million, six hundred forty thousand, six hundred forty-two".