869965680 has 80 divisors (see below), whose sum is σ = 2759644800. Its totient is φ = 226593024.

The previous prime is 869965669. The next prime is 869965687. The reversal of 869965680 is 86569968.

869965680 = T₃₆₄ + T₃₆₅ + ... + T₁₇₃₉.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 869965680.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (869965687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31830 + ... + 52469.

It is an arithmetic number, because the mean of its divisors is an integer number (34495560).

Almost surely, 2^869965680 is an apocalyptic number.

869965680 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

869965680 is an abundant number, since it is smaller than the sum of its proper divisors (1889679120).

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

869965680 is a wasteful number, since it uses less digits than its factorization.

869965680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84358 (or 84352 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 57.

The square root of 869965680 is about 29495.1806232815. The cubic root of 869965680 is about 954.6277178000.

The spelling of 869965680 in words is "eight hundred sixty-nine million, nine hundred sixty-five thousand, six hundred eighty".