745637520 has 80 divisors (see below), whose sum is σ = 2433147840. Its totient is φ = 188370432.

The previous prime is 745637509. The next prime is 745637533. The reversal of 745637520 is 25736547.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×745637520² = 1111950622463500800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77199 + ... + 86318.

It is an arithmetic number, because the mean of its divisors is an integer number (30414348).

Almost surely, 2^745637520 is an apocalyptic number.

It is an amenable number.

745637520 is an abundant number, since it is smaller than the sum of its proper divisors (1687510320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

745637520 is a wasteful number, since it uses less digits than its factorization.

745637520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163552 (or 163546 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 39.

The square root of 745637520 is about 27306.3640933757. The cubic root of 745637520 is about 906.7952804380.

The spelling of 745637520 in words is "seven hundred forty-five million, six hundred thirty-seven thousand, five hundred twenty".