1199780064 has 72 divisors (see below), whose sum is σ = 3899291760. Its totient is φ = 342793728.

The previous prime is 1199780059. The next prime is 1199780069. The reversal of 1199780064 is 4600879911.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1199780059) and next prime (1199780069).

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1199780069) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 295549 + ... + 299580.

It is an arithmetic number, because the mean of its divisors is an integer number (54156830).

Almost surely, 2^1199780064 is an apocalyptic number.

1199780064 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1199780064 is an abundant number, since it is smaller than the sum of its proper divisors (2699511696).

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

1199780064 is a wasteful number, since it uses less digits than its factorization.

1199780064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595152 (or 595141 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 1199780064 is about 34637.8415031884. The cubic root of 1199780064 is about 1062.5936438618.

The spelling of 1199780064 in words is "one billion, one hundred ninety-nine million, seven hundred eighty thousand, sixty-four".