2061977640 has 32 divisors (see below), whose sum is σ = 6185933280. Its totient is φ = 549860672.

The previous prime is 2061977629. The next prime is 2061977653. The reversal of 2061977640 is 467791602.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 2061977592 and 2061977601.

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, 8591454 + ... + 8591693.

It is an arithmetic number, because the mean of its divisors is an integer number (193310415).

Almost surely, 2^2061977640 is an apocalyptic number.

2061977640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2061977640 is an abundant number, since it is smaller than the sum of its proper divisors (4123955640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2061977640 is a wasteful number, since it uses less digits than its factorization.

2061977640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17183161 (or 17183157 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 42.

The square root of 2061977640 is about 45409.0039529607. The cubic root of 2061977640 is about 1272.8033718938.

The spelling of 2061977640 in words is "two billion, sixty-one million, nine hundred seventy-seven thousand, six hundred forty".