77641960 has 32 divisors (see below), whose sum is σ = 190576800. Its totient is φ = 28233280.

The previous prime is 77641943. The next prime is 77641969. The reversal of 77641960 is 6914677.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (77641969) 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, 87790 + ... + 88669.

It is an arithmetic number, because the mean of its divisors is an integer number (5955525).

Almost surely, 2^77641960 is an apocalyptic number.

It is an amenable number.

77641960 is an abundant number, since it is smaller than the sum of its proper divisors (112934840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77641960 is a wasteful number, since it uses less digits than its factorization.

77641960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176481 (or 176477 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 77641960 is about 8811.4675281703. The cubic root of 77641960 is about 426.6111120159.

The spelling of 77641960 in words is "seventy-seven million, six hundred forty-one thousand, nine hundred sixty".