73690561 has 12 divisors (see below), whose sum is σ = 86227092. Its totient is φ = 62791008.

The previous prime is 73690523. The next prime is 73690583. The reversal of 73690561 is 16509637.

It can be written as a sum of positive squares in 2 ways, for example, as 34000561 + 39690000 = 5831^2 + 6300^2 .

It is not a de Polignac number, because 73690561 - 2¹⁹ = 73166273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 73690561.

It is not an unprimeable number, because it can be changed into a prime (73690061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4131 + ... + 12823.

It is an arithmetic number, because the mean of its divisors is an integer number (7185591).

Almost surely, 2^73690561 is an apocalyptic number.

It is an amenable number.

73690561 is a deficient number, since it is larger than the sum of its proper divisors (12536531).

73690561 is a wasteful number, since it uses less digits than its factorization.

73690561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8880 (or 8873 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 73690561 is about 8584.3206487176. The cubic root of 73690561 is about 419.2476345391.

The spelling of 73690561 in words is "seventy-three million, six hundred ninety thousand, five hundred sixty-one".