745071621 has 16 divisors (see below), whose sum is σ = 1161752064. Its totient is φ = 415853424.

The previous prime is 745071617. The next prime is 745071641. The reversal of 745071621 is 126170547.

It is not a de Polignac number, because 745071621 - 2² = 745071617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (745071611) 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, 411651 + ... + 413456.

It is an arithmetic number, because the mean of its divisors is an integer number (72609504).

Almost surely, 2^745071621 is an apocalyptic number.

It is an amenable number.

745071621 is a deficient number, since it is larger than the sum of its proper divisors (416680443).

745071621 is a wasteful number, since it uses less digits than its factorization.

745071621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825160.

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 745071621 is about 27296.0000915885. Note that the first 4 decimals coincide. The cubic root of 745071621 is about 906.5658193383.

The spelling of 745071621 in words is "seven hundred forty-five million, seventy-one thousand, six hundred twenty-one".