77542740 has 72 divisors (see below), whose sum is σ = 256602528. Its totient is φ = 18797760.

The previous prime is 77542739. The next prime is 77542757. The reversal of 77542740 is 4724577.

It is a happy number.

77542740 is a `hidden beast` number, since 77 + 542 + 7 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 77542695 and 77542704.

It is a congruent number.

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, 17602 + ... + 21561.

It is an arithmetic number, because the mean of its divisors is an integer number (3563924).

Almost surely, 2^77542740 is an apocalyptic number.

It is an amenable number.

77542740 is an abundant number, since it is smaller than the sum of its proper divisors (179059788).

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

77542740 is a wasteful number, since it uses less digits than its factorization.

77542740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39189 (or 39184 counting only the distinct ones).

The product of its (nonzero) digits is 54880, while the sum is 36.

The square root of 77542740 is about 8805.8355651238. The cubic root of 77542740 is about 426.4293099849.

The spelling of 77542740 in words is "seventy-seven million, five hundred forty-two thousand, seven hundred forty".