77121480 has 64 divisors (see below), whose sum is σ = 232119360. Its totient is φ = 20498688.

The previous prime is 77121467. The next prime is 77121481. The reversal of 77121480 is 8412177.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (77121481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43899 + ... + 45621.

It is an arithmetic number, because the mean of its divisors is an integer number (3626865).

Almost surely, 2^77121480 is an apocalyptic number.

It is an amenable number.

77121480 is an abundant number, since it is smaller than the sum of its proper divisors (154997880).

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

77121480 is a wasteful number, since it uses less digits than its factorization.

77121480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2110 (or 2106 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 30.

The square root of 77121480 is about 8781.8836248267. The cubic root of 77121480 is about 425.6556983514.

The spelling of 77121480 in words is "seventy-seven million, one hundred twenty-one thousand, four hundred eighty".