77013561 has 8 divisors (see below), whose sum is σ = 102726304. Its totient is φ = 51321600.

The previous prime is 77013557. The next prime is 77013617. The reversal of 77013561 is 16531077.

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

It is not a de Polignac number, because 77013561 - 2² = 77013557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77013511) 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, 8985 + ... + 15321.

It is an arithmetic number, because the mean of its divisors is an integer number (12840788).

Almost surely, 2^77013561 is an apocalyptic number.

It is an amenable number.

77013561 is a deficient number, since it is larger than the sum of its proper divisors (25712743).

77013561 is a wasteful number, since it uses less digits than its factorization.

77013561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10391.

The product of its (nonzero) digits is 4410, while the sum is 30.

The square root of 77013561 is about 8775.7370630620. The cubic root of 77013561 is about 425.4570603031.

The spelling of 77013561 in words is "seventy-seven million, thirteen thousand, five hundred sixty-one".