77452140 has 24 divisors (see below), whose sum is σ = 216866160. Its totient is φ = 20653888.

The previous prime is 77452129. The next prime is 77452147. The reversal of 77452140 is 4125477.

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

It is a junction number, because it is equal to n+sod(n) for n = 77452098 and 77452107.

It is not an unprimeable number, because it can be changed into a prime (77452147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 645375 + ... + 645494.

It is an arithmetic number, because the mean of its divisors is an integer number (9036090).

Almost surely, 2^77452140 is an apocalyptic number.

It is an amenable number.

77452140 is an abundant number, since it is smaller than the sum of its proper divisors (139414020).

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

77452140 is a wasteful number, since it uses less digits than its factorization.

77452140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1290881 (or 1290879 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 30.

The square root of 77452140 is about 8800.6897456961. The cubic root of 77452140 is about 426.2631669780.

The spelling of 77452140 in words is "seventy-seven million, four hundred fifty-two thousand, one hundred forty".