74904781 has 6 divisors (see below), whose sum is σ = 87134190. Its totient is φ = 64204056.

The previous prime is 74904763. The next prime is 74904799. The reversal of 74904781 is 18740947.

It is an interprime number because it is at equal distance from previous prime (74904763) and next prime (74904799).

It can be written as a sum of positive squares in only one way, i.e., 40576900 + 34327881 = 6370^2 + 5859^2 .

It is not a de Polignac number, because 74904781 - 2²¹ = 72807629 is a prime.

It is a super-2 number, since 2×74904781² = 11221452433315922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74904281) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 764286 + ... + 764383.

It is an arithmetic number, because the mean of its divisors is an integer number (14522365).

Almost surely, 2^74904781 is an apocalyptic number.

It is an amenable number.

74904781 is a deficient number, since it is larger than the sum of its proper divisors (12229409).

74904781 is a wasteful number, since it uses less digits than its factorization.

74904781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1528683 (or 1528676 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 74904781 is about 8654.7548203285. The cubic root of 74904781 is about 421.5377885928.

The spelling of 74904781 in words is "seventy-four million, nine hundred four thousand, seven hundred eighty-one".