77620389 has 32 divisors (see below), whose sum is σ = 130827264. Its totient is φ = 39761280.

The previous prime is 77620379. The next prime is 77620393. The reversal of 77620389 is 98302677.

It is not a de Polignac number, because 77620389 - 2⁵ = 77620357 is a prime.

It is a super-2 number, since 2×77620389² = 12049849577022642, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 77620389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77620379) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14562 + ... + 19164.

It is an arithmetic number, because the mean of its divisors is an integer number (4088352).

Almost surely, 2^77620389 is an apocalyptic number.

It is an amenable number.

77620389 is a deficient number, since it is larger than the sum of its proper divisors (53206875).

77620389 is a wasteful number, since it uses less digits than its factorization.

77620389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4697.

The product of its (nonzero) digits is 127008, while the sum is 42.

The square root of 77620389 is about 8810.2434132094. The cubic root of 77620389 is about 426.5716003882.

The spelling of 77620389 in words is "seventy-seven million, six hundred twenty thousand, three hundred eighty-nine".