77312290 has 32 divisors (see below), whose sum is σ = 152254080. Its totient is φ = 28032000.

The previous prime is 77312281. The next prime is 77312293. The reversal of 77312290 is 9221377.

It is not an unprimeable number, because it can be changed into a prime (77312293) 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, 47490 + ... + 49090.

It is an arithmetic number, because the mean of its divisors is an integer number (4757940).

Almost surely, 2^77312290 is an apocalyptic number.

77312290 is a deficient number, since it is larger than the sum of its proper divisors (74941790).

77312290 is a wasteful number, since it uses less digits than its factorization.

77312290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2058.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 77312290 is about 8792.7407558736. The cubic root of 77312290 is about 426.0064543829.

The spelling of 77312290 in words is "seventy-seven million, three hundred twelve thousand, two hundred ninety".