428740691 has 8 divisors (see below), whose sum is σ = 437606064. Its totient is φ = 419904160.

The previous prime is 428740661. The next prime is 428740729. The reversal of 428740691 is 196047824.

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

It is a de Polignac number, because none of the positive numbers 2^k-428740691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428740661) 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, 24221 + ... + 38001.

It is an arithmetic number, because the mean of its divisors is an integer number (54700758).

Almost surely, 2^428740691 is an apocalyptic number.

428740691 is a deficient number, since it is larger than the sum of its proper divisors (8865373).

428740691 is a wasteful number, since it uses less digits than its factorization.

428740691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14421.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 428740691 is about 20706.0544527440. The cubic root of 428740691 is about 754.0466841567.

The spelling of 428740691 in words is "four hundred twenty-eight million, seven hundred forty thousand, six hundred ninety-one".