10721640772 has 12 divisors (see below), whose sum is σ = 18768661996. Its totient is φ = 5359165920.

The previous prime is 10721640737. The next prime is 10721640791. The reversal of 10721640772 is 27704612701.

It can be written as a sum of positive squares in 2 ways, for example, as 9632244736 + 1089396036 = 98144^2 + 33006^2 .

It is a super-2 number, since 2×10721640772² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 398979 + ... + 425002.

Almost surely, 2^10721640772 is an apocalyptic number.

It is an amenable number.

10721640772 is a deficient number, since it is larger than the sum of its proper divisors (8047021224).

10721640772 is a wasteful number, since it uses less digits than its factorization.

10721640772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 827238 (or 827236 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 37.

The spelling of 10721640772 in words is "ten billion, seven hundred twenty-one million, six hundred forty thousand, seven hundred seventy-two".