745677921 has 16 divisors (see below), whose sum is σ = 1023270336. Its totient is φ = 482736576.

The previous prime is 745677913. The next prime is 745677941. The reversal of 745677921 is 129776547.

It is a happy number.

It is not a de Polignac number, because 745677921 - 2³ = 745677913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (745677901) 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, 5611 + ... + 39023.

It is an arithmetic number, because the mean of its divisors is an integer number (63954396).

Almost surely, 2^745677921 is an apocalyptic number.

It is an amenable number.

745677921 is a deficient number, since it is larger than the sum of its proper divisors (277592415).

745677921 is a wasteful number, since it uses less digits than its factorization.

745677921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33632.

The product of its digits is 740880, while the sum is 48.

The square root of 745677921 is about 27307.1038559566. The cubic root of 745677921 is about 906.8116578214.

The spelling of 745677921 in words is "seven hundred forty-five million, six hundred seventy-seven thousand, nine hundred twenty-one".