1201776640 has 48 divisors (see below), whose sum is σ = 2883584340. Its totient is φ = 480706560.

The previous prime is 1201776637. The next prime is 1201776649. The reversal of 1201776640 is 466771021.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1174569984 + 27206656 = 34272^2 + 5216^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1201776596 and 1201776605.

It is not an unprimeable number, because it can be changed into a prime (1201776649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48441 + ... + 68920.

Almost surely, 2^1201776640 is an apocalyptic number.

1201776640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201776640 is an abundant number, since it is smaller than the sum of its proper divisors (1681807700).

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

1201776640 is an equidigital number, since it uses as much as digits as its factorization.

1201776640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117388 (or 117368 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 1201776640 is about 34666.6502564064. The cubic root of 1201776640 is about 1063.1827443926.

The spelling of 1201776640 in words is "one billion, two hundred one million, seven hundred seventy-six thousand, six hundred forty".