76620645 has 24 divisors (see below), whose sum is σ = 135064800. Its totient is φ = 40170336.

The previous prime is 76620637. The next prime is 76620647. The reversal of 76620645 is 54602667.

76620645 is a `hidden beast` number, since 7 + 6 + 6 + 2 + 0 + 645 = 666.

It is not a de Polignac number, because 76620645 - 2³ = 76620637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76620647) 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 23 ways as a sum of consecutive naturals, for example, 11775 + ... + 17084.

It is an arithmetic number, because the mean of its divisors is an integer number (5627700).

Almost surely, 2^76620645 is an apocalyptic number.

It is an amenable number.

76620645 is a deficient number, since it is larger than the sum of its proper divisors (58444155).

76620645 is a wasteful number, since it uses less digits than its factorization.

76620645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28929 (or 28926 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 76620645 is about 8753.3219408405. The cubic root of 76620645 is about 424.7322789095.

The spelling of 76620645 in words is "seventy-six million, six hundred twenty thousand, six hundred forty-five".