1065642880 has 32 divisors (see below), whose sum is σ = 2547554040. Its totient is φ = 426256896.

The previous prime is 1065642871. The next prime is 1065642889. The reversal of 1065642880 is 882465601.

It is an interprime number because it is at equal distance from previous prime (1065642871) and next prime (1065642889).

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×1065642880² = 2271189495389388800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1065642889) 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, 831894 + ... + 833173.

Almost surely, 2^1065642880 is an apocalyptic number.

1065642880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1065642880 is an abundant number, since it is smaller than the sum of its proper divisors (1481911160).

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

1065642880 is an equidigital number, since it uses as much as digits as its factorization.

1065642880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1665086 (or 1665074 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 1065642880 is about 32644.1860060869. The cubic root of 1065642880 is about 1021.4189146443.

The spelling of 1065642880 in words is "one billion, sixty-five million, six hundred forty-two thousand, eight hundred eighty".