77646064 has 10 divisors (see below), whose sum is σ = 150439280. Its totient is φ = 38823024.

The previous prime is 77646061. The next prime is 77646067. The reversal of 77646064 is 46064677.

It is an interprime number because it is at equal distance from previous prime (77646061) and next prime (77646067).

It is a super-2 number, since 2×77646064² = 12057822509384192, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77646061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2426424 + ... + 2426455.

It is an arithmetic number, because the mean of its divisors is an integer number (15043928).

Almost surely, 2^77646064 is an apocalyptic number.

It is an amenable number.

77646064 is a deficient number, since it is larger than the sum of its proper divisors (72793216).

77646064 is a wasteful number, since it uses less digits than its factorization.

77646064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4852887 (or 4852881 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 40.

The square root of 77646064 is about 8811.7004034409. The cubic root of 77646064 is about 426.6186284892.

The spelling of 77646064 in words is "seventy-seven million, six hundred forty-six thousand, sixty-four".