745872981 has 16 divisors (see below), whose sum is σ = 1147824768. Its totient is φ = 421992000.

The previous prime is 745872979. The next prime is 745873013. The reversal of 745872981 is 189278547.

It is not a de Polignac number, because 745872981 - 2¹ = 745872979 is a prime.

It is a super-2 number, since 2×745872981² = 1112653007571652722, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (745872181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 173710 + ... + 177951.

It is an arithmetic number, because the mean of its divisors is an integer number (71739048).

Almost surely, 2^745872981 is an apocalyptic number.

It is an amenable number.

745872981 is a deficient number, since it is larger than the sum of its proper divisors (401951787).

745872981 is a wasteful number, since it uses less digits than its factorization.

745872981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351772.

The product of its digits is 1128960, while the sum is 51.

The square root of 745872981 is about 27310.6752205067. The cubic root of 745872981 is about 906.8907211166.

The spelling of 745872981 in words is "seven hundred forty-five million, eight hundred seventy-two thousand, nine hundred eighty-one".