720691494 has 16 divisors (see below), whose sum is σ = 1442210160. Its totient is φ = 240092640.

The previous prime is 720691493. The next prime is 720691547. The reversal of 720691494 is 494196027.

720691494 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×720691494³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720691493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22837 + ... + 44304.

It is an arithmetic number, because the mean of its divisors is an integer number (90138135).

Almost surely, 2^720691494 is an apocalyptic number.

720691494 is an abundant number, since it is smaller than the sum of its proper divisors (721518666).

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

720691494 is a wasteful number, since it uses less digits than its factorization.

720691494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68935.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 720691494 is about 26845.6978676286. The cubic root of 720691494 is about 896.5677894007.

The spelling of 720691494 in words is "seven hundred twenty million, six hundred ninety-one thousand, four hundred ninety-four".