47078621 has 4 divisors (see below), whose sum is σ = 47227452. Its totient is φ = 46929792.

The previous prime is 47078617. The next prime is 47078639. The reversal of 47078621 is 12687074.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12687074 = 2 ⋅6343537.

It can be written as a sum of positive squares in 2 ways, for example, as 688900 + 46389721 = 830^2 + 6811^2 .

It is a cyclic number.

It is not a de Polignac number, because 47078621 - 2² = 47078617 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 (47078651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73940 + ... + 74573.

It is an arithmetic number, because the mean of its divisors is an integer number (11806863).

Almost surely, 2^47078621 is an apocalyptic number.

It is an amenable number.

47078621 is a deficient number, since it is larger than the sum of its proper divisors (148831).

47078621 is a wasteful number, since it uses less digits than its factorization.

47078621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148830.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 47078621 is about 6861.3862302016. The cubic root of 47078621 is about 361.0837225215.

The spelling of 47078621 in words is "forty-seven million, seventy-eight thousand, six hundred twenty-one".