709545690 has 128 divisors (see below), whose sum is σ = 2276352000. Its totient is φ = 153638208.

The previous prime is 709545673. The next prime is 709545703. The reversal of 709545690 is 96545907.

It is a happy number.

It is a super-2 number, since 2×709545690² = 1006910172395152200, which contains 22 as substring.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 26031 + ... + 45789.

It is an arithmetic number, because the mean of its divisors is an integer number (17784000).

Almost surely, 2^709545690 is an apocalyptic number.

709545690 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 709545690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1138176000).

709545690 is an abundant number, since it is smaller than the sum of its proper divisors (1566806310).

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

709545690 is a wasteful number, since it uses less digits than its factorization.

709545690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19801 (or 19795 counting only the distinct ones).

The product of its (nonzero) digits is 340200, while the sum is 45.

The square root of 709545690 is about 26637.2988495455. The cubic root of 709545690 is about 891.9218202845.

The spelling of 709545690 in words is "seven hundred nine million, five hundred forty-five thousand, six hundred ninety".