74021661 has 32 divisors (see below), whose sum is σ = 125748480. Its totient is φ = 42156288.

The previous prime is 74021653. The next prime is 74021669. The reversal of 74021661 is 16612047.

It is an interprime number because it is at equal distance from previous prime (74021653) and next prime (74021669).

It is not a de Polignac number, because 74021661 - 2³ = 74021653 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74021669) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85945 + ... + 86801.

It is an arithmetic number, because the mean of its divisors is an integer number (3929640).

Almost surely, 2^74021661 is an apocalyptic number.

It is an amenable number.

74021661 is a deficient number, since it is larger than the sum of its proper divisors (51726819).

74021661 is a wasteful number, since it uses less digits than its factorization.

74021661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330 (or 1324 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 74021661 is about 8603.5841949736. The cubic root of 74021661 is about 419.8746054232.

The spelling of 74021661 in words is "seventy-four million, twenty-one thousand, six hundred sixty-one".