77072690 has 8 divisors (see below), whose sum is σ = 138730860. Its totient is φ = 30829072.

The previous prime is 77072689. The next prime is 77072693. The reversal of 77072690 is 9627077.

It can be written as a sum of positive squares in 2 ways, for example, as 77070841 + 1849 = 8779^2 + 43^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×77072690² = 11880399087672200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77072693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3853625 + ... + 3853644.

Almost surely, 2^77072690 is an apocalyptic number.

77072690 is a deficient number, since it is larger than the sum of its proper divisors (61658170).

77072690 is a wasteful number, since it uses less digits than its factorization.

77072690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7707276.

The product of its (nonzero) digits is 37044, while the sum is 38.

The square root of 77072690 is about 8779.1053074901. The cubic root of 77072690 is about 425.5659173870.

The spelling of 77072690 in words is "seventy-seven million, seventy-two thousand, six hundred ninety".