1020640641 has 8 divisors (see below), whose sum is σ = 1361777760. Its totient is φ = 679965312.

The previous prime is 1020640633. The next prime is 1020640711. The reversal of 1020640641 is 1460460201.

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

It is not a de Polignac number, because 1020640641 - 2³ = 1020640633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1020640541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110256 + ... + 119153.

It is an arithmetic number, because the mean of its divisors is an integer number (170222220).

Almost surely, 2^1020640641 is an apocalyptic number.

It is an amenable number.

1020640641 is a deficient number, since it is larger than the sum of its proper divisors (341137119).

1020640641 is a wasteful number, since it uses less digits than its factorization.

1020640641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230895.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 1020640641 is about 31947.4668948886. The cubic root of 1020640641 is about 1006.8334117868.

The spelling of 1020640641 in words is "one billion, twenty million, six hundred forty thousand, six hundred forty-one".