77601561 has 8 divisors (see below), whose sum is σ = 105992544. Its totient is φ = 50472480.

The previous prime is 77601553. The next prime is 77601599. The reversal of 77601561 is 16510677.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77601561 - 2³ = 77601553 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (77601061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 315331 + ... + 315576.

It is an arithmetic number, because the mean of its divisors is an integer number (13249068).

Almost surely, 2^77601561 is an apocalyptic number.

It is an amenable number.

77601561 is a deficient number, since it is larger than the sum of its proper divisors (28390983).

77601561 is a wasteful number, since it uses less digits than its factorization.

77601561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630951.

The product of its (nonzero) digits is 8820, while the sum is 33.

The square root of 77601561 is about 8809.1748194709. The cubic root of 77601561 is about 426.5371071334.

The spelling of 77601561 in words is "seventy-seven million, six hundred one thousand, five hundred sixty-one".