77261480640 has 168 divisors, whose sum is σ = 275590071120. Its totient is φ = 20603040768.

The previous prime is 77261480633. The next prime is 77261480671. The reversal of 77261480640 is 4608416277.

77261480640 is a `hidden beast` number, since 7 + 72 + 61 + 480 + 6 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 419035 + ... + 574554.

It is an arithmetic number, because the mean of its divisors is an integer number (1640417090).

Almost surely, 2^77261480640 is an apocalyptic number.

It is an amenable number.

77261480640 is an abundant number, since it is smaller than the sum of its proper divisors (198328590480).

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

77261480640 is an equidigital number, since it uses as much as digits as its factorization.

77261480640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993621 (or 993599 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 45.

The spelling of 77261480640 in words is "seventy-seven billion, two hundred sixty-one million, four hundred eighty thousand, six hundred forty".