77421445 has 16 divisors (see below), whose sum is σ = 96390000. Its totient is φ = 59627008.

The previous prime is 77421437. The next prime is 77421467. The reversal of 77421445 is 54412477.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 9012004 + 68409441 = 3002^2 + 8271^2 .

It is a cyclic number.

It is not a de Polignac number, because 77421445 - 2³ = 77421437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77421445.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73281 + ... + 74329.

It is an arithmetic number, because the mean of its divisors is an integer number (6024375).

Almost surely, 2^77421445 is an apocalyptic number.

It is an amenable number.

77421445 is a deficient number, since it is larger than the sum of its proper divisors (18968555).

77421445 is a wasteful number, since it uses less digits than its factorization.

77421445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1592.

The product of its digits is 31360, while the sum is 34.

The square root of 77421445 is about 8798.9456754773. The cubic root of 77421445 is about 426.2068488580.

The spelling of 77421445 in words is "seventy-seven million, four hundred twenty-one thousand, four hundred forty-five".