1971606720 has 56 divisors (see below), whose sum is σ = 6259854384. Its totient is φ = 525761536.

The previous prime is 1971606701. The next prime is 1971606737. The reversal of 1971606720 is 276061791.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

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, 1025919 + ... + 1027838.

It is an arithmetic number, because the mean of its divisors is an integer number (111783114).

Almost surely, 2^1971606720 is an apocalyptic number.

1971606720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1971606720 is an abundant number, since it is smaller than the sum of its proper divisors (4288247664).

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

1971606720 is a wasteful number, since it uses less digits than its factorization.

1971606720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2053777 (or 2053767 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 39.

The square root of 1971606720 is about 44402.7782914538. The cubic root of 1971606720 is about 1253.9303955729.

The spelling of 1971606720 in words is "one billion, nine hundred seventy-one million, six hundred six thousand, seven hundred twenty".