780728231 has 8 divisors (see below), whose sum is σ = 804673104. Its totient is φ = 756933120.

The previous prime is 780728219. The next prime is 780728243. The reversal of 780728231 is 132827087.

It is an interprime number because it is at equal distance from previous prime (780728219) and next prime (780728243).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 780728231 - 2¹⁴ = 780711847 is a prime.

It is a super-2 number, since 2×780728231² = 1219073141360778722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (780728731) 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, 26810 + ... + 47751.

It is an arithmetic number, because the mean of its divisors is an integer number (100584138).

Almost surely, 2^780728231 is an apocalyptic number.

780728231 is a deficient number, since it is larger than the sum of its proper divisors (23944873).

780728231 is a wasteful number, since it uses less digits than its factorization.

780728231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74881.

The product of its (nonzero) digits is 37632, while the sum is 38.

The square root of 780728231 is about 27941.5144721971. The cubic root of 780728231 is about 920.8027928984.

The spelling of 780728231 in words is "seven hundred eighty million, seven hundred twenty-eight thousand, two hundred thirty-one".