191007428 has 6 divisors (see below), whose sum is σ = 334263006. Its totient is φ = 95503712.

The previous prime is 191007413. The next prime is 191007451. The reversal of 191007428 is 824700191.

It can be written as a sum of positive squares in only one way, i.e., 187197124 + 3810304 = 13682^2 + 1952^2 .

It is a junction number, because it is equal to n+sod(n) for n = 191007394 and 191007403.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23875925 + ... + 23875932.

It is an arithmetic number, because the mean of its divisors is an integer number (55710501).

Almost surely, 2^191007428 is an apocalyptic number.

It is an amenable number.

191007428 is a deficient number, since it is larger than the sum of its proper divisors (143255578).

191007428 is a wasteful number, since it uses less digits than its factorization.

191007428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47751861 (or 47751859 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 191007428 is about 13820.5436940809. The cubic root of 191007428 is about 575.9039875011.

The spelling of 191007428 in words is "one hundred ninety-one million, seven thousand, four hundred twenty-eight".