628041731 has 4 divisors (see below), whose sum is σ = 643359864. Its totient is φ = 612723600.

The previous prime is 628041721. The next prime is 628041763. The reversal of 628041731 is 137140826.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-628041731 is a prime.

It is a super-2 number, since 2×628041731² = 788872831754952722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (628041721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7659005 + ... + 7659086.

It is an arithmetic number, because the mean of its divisors is an integer number (160839966).

Almost surely, 2^628041731 is an apocalyptic number.

628041731 is a deficient number, since it is larger than the sum of its proper divisors (15318133).

628041731 is a wasteful number, since it uses less digits than its factorization.

628041731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15318132.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 628041731 is about 25060.7607825461. The cubic root of 628041731 is about 856.3727391423.

The spelling of 628041731 in words is "six hundred twenty-eight million, forty-one thousand, seven hundred thirty-one".