787728261 has 8 divisors (see below), whose sum is σ = 1078691104. Its totient is φ = 510958800.

The previous prime is 787728257. The next prime is 787728289. The reversal of 787728261 is 162827787.

It is a happy number.

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

It is not a de Polignac number, because 787728261 - 2² = 787728257 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 787728261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (787728061) 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, 3548215 + ... + 3548436.

It is an arithmetic number, because the mean of its divisors is an integer number (134836388).

Almost surely, 2^787728261 is an apocalyptic number.

It is an amenable number.

787728261 is a deficient number, since it is larger than the sum of its proper divisors (290962843).

787728261 is a wasteful number, since it uses less digits than its factorization.

787728261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7096691.

The product of its digits is 526848, while the sum is 48.

The square root of 787728261 is about 28066.4971273581. The cubic root of 787728261 is about 923.5465895905.

The spelling of 787728261 in words is "seven hundred eighty-seven million, seven hundred twenty-eight thousand, two hundred sixty-one".