77242390 has 32 divisors (see below), whose sum is σ = 151974144. Its totient is φ = 28139520.

The previous prime is 77242379. The next prime is 77242397. The reversal of 77242390 is 9324277.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77242397) 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, 2059 + ... + 12598.

It is an arithmetic number, because the mean of its divisors is an integer number (4749192).

Almost surely, 2^77242390 is an apocalyptic number.

77242390 is a deficient number, since it is larger than the sum of its proper divisors (74731754).

77242390 is a wasteful number, since it uses less digits than its factorization.

77242390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14712.

The product of its (nonzero) digits is 21168, while the sum is 34.

The square root of 77242390 is about 8788.7649871868. The cubic root of 77242390 is about 425.8780279280.

The spelling of 77242390 in words is "seventy-seven million, two hundred forty-two thousand, three hundred ninety".