77157440 has 28 divisors (see below), whose sum is σ = 183731916. Its totient is φ = 30862848.

The previous prime is 77157439. The next prime is 77157463. The reversal of 77157440 is 4475177.

It can be written as a sum of positive squares in 2 ways, for example, as 60964864 + 16192576 = 7808^2 + 4024^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 77157440.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120239 + ... + 120878.

Almost surely, 2^77157440 is an apocalyptic number.

It is an amenable number.

77157440 is an abundant number, since it is smaller than the sum of its proper divisors (106574476).

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

77157440 is a wasteful number, since it uses less digits than its factorization.

77157440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241134 (or 241124 counting only the distinct ones).

The product of its (nonzero) digits is 27440, while the sum is 35.

The square root of 77157440 is about 8783.9307829695. The cubic root of 77157440 is about 425.7218459430.

The spelling of 77157440 in words is "seventy-seven million, one hundred fifty-seven thousand, four hundred forty".