77625761 has 8 divisors (see below), whose sum is σ = 79254504. Its totient is φ = 76003200.

The previous prime is 77625749. The next prime is 77625763. The reversal of 77625761 is 16752677.

It can be written as a sum of positive squares in 4 ways, for example, as 52475536 + 25150225 = 7244^2 + 5015^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 77625761 - 2¹⁴ = 77609377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77625763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30635 + ... + 33071.

It is an arithmetic number, because the mean of its divisors is an integer number (9906813).

Almost surely, 2^77625761 is an apocalyptic number.

It is an amenable number.

77625761 is a deficient number, since it is larger than the sum of its proper divisors (1628743).

77625761 is a wasteful number, since it uses less digits than its factorization.

77625761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3091.

The product of its digits is 123480, while the sum is 41.

The square root of 77625761 is about 8810.5482803285. The cubic root of 77625761 is about 426.5814409717.

The spelling of 77625761 in words is "seventy-seven million, six hundred twenty-five thousand, seven hundred sixty-one".