77021461 has 6 divisors (see below), whose sum is σ = 84660086. Its totient is φ = 70019400.

The previous prime is 77021449. The next prime is 77021501. The reversal of 77021461 is 16412077.

It can be written as a sum of positive squares in only one way, i.e., 61858225 + 15163236 = 7865^2 + 3894^2 .

It is not a de Polignac number, because 77021461 - 2²⁵ = 43467029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77028461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 318150 + ... + 318391.

Almost surely, 2^77021461 is an apocalyptic number.

It is an amenable number.

77021461 is a deficient number, since it is larger than the sum of its proper divisors (7638625).

77021461 is a wasteful number, since it uses less digits than its factorization.

77021461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636563 (or 636552 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 77021461 is about 8776.1871561630. The cubic root of 77021461 is about 425.4716075067.

The spelling of 77021461 in words is "seventy-seven million, twenty-one thousand, four hundred sixty-one".