74634561 has 16 divisors (see below), whose sum is σ = 112129920. Its totient is φ = 49054320.

The previous prime is 74634559. The next prime is 74634601. The reversal of 74634561 is 16543647.

It is a happy number.

It is not a de Polignac number, because 74634561 - 2¹ = 74634559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (74634361) 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, 17550 + ... + 21383.

It is an arithmetic number, because the mean of its divisors is an integer number (7008120).

Almost surely, 2^74634561 is an apocalyptic number.

74634561 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

74634561 is a deficient number, since it is larger than the sum of its proper divisors (37495359).

74634561 is a wasteful number, since it uses less digits than its factorization.

74634561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39013 (or 39007 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The square root of 74634561 is about 8639.1296436620. The cubic root of 74634561 is about 421.0302767460.

The spelling of 74634561 in words is "seventy-four million, six hundred thirty-four thousand, five hundred sixty-one".