77332561 has 4 divisors (see below), whose sum is σ = 78421824. Its totient is φ = 76243300.

The previous prime is 77332559. The next prime is 77332573. The reversal of 77332561 is 16523377.

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: 16523377 = 13 ⋅1271029.

It is a cyclic number.

It is not a de Polignac number, because 77332561 - 2¹ = 77332559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77332861) 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, 544525 + ... + 544666.

It is an arithmetic number, because the mean of its divisors is an integer number (19605456).

Almost surely, 2^77332561 is an apocalyptic number.

77332561 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

77332561 is a deficient number, since it is larger than the sum of its proper divisors (1089263).

77332561 is a wasteful number, since it uses less digits than its factorization.

77332561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089262.

The product of its digits is 26460, while the sum is 34.

The square root of 77332561 is about 8793.8933925765. The cubic root of 77332561 is about 426.0436835746.

The spelling of 77332561 in words is "seventy-seven million, three hundred thirty-two thousand, five hundred sixty-one".