1969712640 has 800 divisors, whose sum is σ = 8555880960. Its totient is φ = 423346176.

The previous prime is 1969712639. The next prime is 1969712677. The reversal of 1969712640 is 462179691.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 33384931 + ... + 33384989.

Almost surely, 2^1969712640 is an apocalyptic number.

1969712640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1969712640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4277940480).

1969712640 is an abundant number, since it is smaller than the sum of its proper divisors (6586168320).

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

1969712640 is an equidigital number, since it uses as much as digits as its factorization.

1969712640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124 (or 99 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 1969712640 is about 44381.4447714357. Note that the first 3 decimals coincide. The cubic root of 1969712640 is about 1253.5287256359.

The spelling of 1969712640 in words is "one billion, nine hundred sixty-nine million, seven hundred twelve thousand, six hundred forty".