745409690 has 16 divisors (see below), whose sum is σ = 1343581128. Its totient is φ = 297754176.

The previous prime is 745409681. The next prime is 745409699. The reversal of 745409690 is 96904547.

It is an interprime number because it is at equal distance from previous prime (745409681) and next prime (745409699).

It can be written as a sum of positive squares in 4 ways, for example, as 692163481 + 53246209 = 26309^2 + 7297^2 .

It is a super-2 number, since 2×745409690² = 1111271211891792200, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (745409699) 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, 43517 + ... + 58176.

Almost surely, 2^745409690 is an apocalyptic number.

745409690 is a deficient number, since it is larger than the sum of its proper divisors (598171438).

745409690 is a wasteful number, since it uses less digits than its factorization.

745409690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102433.

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 745409690 is about 27302.1920365380. The cubic root of 745409690 is about 906.7029137458.

The spelling of 745409690 in words is "seven hundred forty-five million, four hundred nine thousand, six hundred ninety".