1161378640 has 40 divisors (see below), whose sum is σ = 2704869288. Its totient is φ = 463749120.

The previous prime is 1161378623. The next prime is 1161378641. The reversal of 1161378640 is 468731611.

It can be written as a sum of positive squares in 4 ways, for example, as 1567504 + 1159811136 = 1252^2 + 34056^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 1161378640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161378641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35200 + ... + 59680.

Almost surely, 2^1161378640 is an apocalyptic number.

1161378640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1161378640 is an abundant number, since it is smaller than the sum of its proper divisors (1543490648).

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

1161378640 is a wasteful number, since it uses less digits than its factorization.

1161378640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25087 (or 25081 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 1161378640 is about 34079.0058540445. The cubic root of 1161378640 is about 1051.1336629446.

The spelling of 1161378640 in words is "one billion, one hundred sixty-one million, three hundred seventy-eight thousand, six hundred forty".