697642578 has 64 divisors (see below), whose sum is σ = 1655470080. Its totient is φ = 217247184.

The previous prime is 697642577. The next prime is 697642591. The reversal of 697642578 is 875246796.

697642578 is a `hidden beast` number, since 6 + 9 + 7 + 64 + 2 + 578 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (697642571) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46875 + ... + 59937.

It is an arithmetic number, because the mean of its divisors is an integer number (25866720).

Almost surely, 2^697642578 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 697642578, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (827735040).

697642578 is an abundant number, since it is smaller than the sum of its proper divisors (957827502).

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

697642578 is a wasteful number, since it uses less digits than its factorization.

697642578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13140 (or 13134 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 54.

The square root of 697642578 is about 26412.9244499734. The cubic root of 697642578 is about 886.9061357510.

The spelling of 697642578 in words is "six hundred ninety-seven million, six hundred forty-two thousand, five hundred seventy-eight".