744537861 has 6 divisors (see below), whose sum is σ = 1075443590. Its totient is φ = 496358568.

The previous prime is 744537847. The next prime is 744537863. The reversal of 744537861 is 168735447.

744537861 is a `hidden beast` number, since 74 + 453 + 78 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 665949636 + 78588225 = 25806^2 + 8865^2 .

It is not a de Polignac number, because 744537861 - 2¹⁵ = 744505093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (744537863) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 41363206 + ... + 41363223.

Almost surely, 2^744537861 is an apocalyptic number.

It is an amenable number.

744537861 is a deficient number, since it is larger than the sum of its proper divisors (330905729).

744537861 is a wasteful number, since it uses less digits than its factorization.

744537861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82726435 (or 82726432 counting only the distinct ones).

The product of its digits is 564480, while the sum is 45.

The square root of 744537861 is about 27286.2210831768. The cubic root of 744537861 is about 906.3492834802.

The spelling of 744537861 in words is "seven hundred forty-four million, five hundred thirty-seven thousand, eight hundred sixty-one".