697778407 has 4 divisors (see below), whose sum is σ = 697882360. Its totient is φ = 697674456.

The previous prime is 697778377. The next prime is 697778437. The reversal of 697778407 is 704877796.

697778407 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (697778377) and next prime (697778437).

It is a cyclic number.

It is not a de Polignac number, because 697778407 - 2¹⁵ = 697745639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (697778437) 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, 41157 + ... + 55582.

It is an arithmetic number, because the mean of its divisors is an integer number (174470590).

Almost surely, 2^697778407 is an apocalyptic number.

697778407 is a deficient number, since it is larger than the sum of its proper divisors (103953).

697778407 is an equidigital number, since it uses as much as digits as its factorization.

697778407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103952.

The product of its (nonzero) digits is 4148928, while the sum is 55.

The square root of 697778407 is about 26415.4955849781. The cubic root of 697778407 is about 886.9636913724.

The spelling of 697778407 in words is "six hundred ninety-seven million, seven hundred seventy-eight thousand, four hundred seven".