709605540 has 144 divisors (see below), whose sum is σ = 2589525120. Its totient is φ = 153653760.

The previous prime is 709605539. The next prime is 709605569. The reversal of 709605540 is 45506907.

709605540 is a `hidden beast` number, since 7 + 0 + 9 + 605 + 5 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 709605495 and 709605504.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9120 + ... + 38760.

Almost surely, 2^709605540 is an apocalyptic number.

709605540 is a gapful number since it is divisible by the number (70) 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 709605540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1294762560).

709605540 is an abundant number, since it is smaller than the sum of its proper divisors (1879919580).

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

709605540 is a wasteful number, since it uses less digits than its factorization.

709605540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29682 (or 29677 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 709605540 is about 26638.4222505763. The cubic root of 709605540 is about 891.9468973730.

The spelling of 709605540 in words is "seven hundred nine million, six hundred five thousand, five hundred forty".