77513428 has 6 divisors (see below), whose sum is σ = 135648506. Its totient is φ = 38756712.

The previous prime is 77513419. The next prime is 77513437. The reversal of 77513428 is 82431577.

It is an interprime number because it is at equal distance from previous prime (77513419) and next prime (77513437).

It can be written as a sum of positive squares in only one way, i.e., 42797764 + 34715664 = 6542^2 + 5892^2 .

It is a super-2 number, since 2×77513428² = 12016663040622368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9689175 + ... + 9689182.

Almost surely, 2^77513428 is an apocalyptic number.

It is an amenable number.

77513428 is a deficient number, since it is larger than the sum of its proper divisors (58135078).

77513428 is a wasteful number, since it uses less digits than its factorization.

77513428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19378361 (or 19378359 counting only the distinct ones).

The product of its digits is 47040, while the sum is 37.

The square root of 77513428 is about 8804.1710569480. The cubic root of 77513428 is about 426.3755715724.

The spelling of 77513428 in words is "seventy-seven million, five hundred thirteen thousand, four hundred twenty-eight".