1649180388 has 12 divisors (see below), whose sum is σ = 3848087600. Its totient is φ = 549726792.

The previous prime is 1649180363. The next prime is 1649180389. The reversal of 1649180388 is 8830819461.

1649180388 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1649180389) 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, 68715838 + ... + 68715861.

Almost surely, 2^1649180388 is an apocalyptic number.

It is an amenable number.

1649180388 is an abundant number, since it is smaller than the sum of its proper divisors (2198907212).

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

1649180388 is a wasteful number, since it uses less digits than its factorization.

1649180388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137431706 (or 137431704 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 48.

The square root of 1649180388 is about 40610.1020437034. The cubic root of 1649180388 is about 1181.4700599954.

The spelling of 1649180388 in words is "one billion, six hundred forty-nine million, one hundred eighty thousand, three hundred eighty-eight".