74013661 has 4 divisors (see below), whose sum is σ = 74052000. Its totient is φ = 73975324.

The previous prime is 74013659. The next prime is 74013677. The reversal of 74013661 is 16631047.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16631047 = 23 ⋅723089.

It is a cyclic number.

It is not a de Polignac number, because 74013661 - 2¹ = 74013659 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 (74013161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16111 + ... + 20188.

It is an arithmetic number, because the mean of its divisors is an integer number (18513000).

Almost surely, 2^74013661 is an apocalyptic number.

It is an amenable number.

74013661 is a deficient number, since it is larger than the sum of its proper divisors (38339).

74013661 is a wasteful number, since it uses less digits than its factorization.

74013661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38338.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 74013661 is about 8603.1192598964. The cubic root of 74013661 is about 419.8594786896.

The spelling of 74013661 in words is "seventy-four million, thirteen thousand, six hundred sixty-one".