72378451 has 4 divisors (see below), whose sum is σ = 72396504. Its totient is φ = 72360400.

The previous prime is 72378437. The next prime is 72378463. The reversal of 72378451 is 15487327.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15487327 = 421 ⋅36787.

It is a cyclic number.

It is not a de Polignac number, because 72378451 - 2¹⁹ = 71854163 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72378451.

It is not an unprimeable number, because it can be changed into a prime (72378431) 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, 10 + ... + 12031.

It is an arithmetic number, because the mean of its divisors is an integer number (18099126).

Almost surely, 2^72378451 is an apocalyptic number.

72378451 is a deficient number, since it is larger than the sum of its proper divisors (18053).

72378451 is a wasteful number, since it uses less digits than its factorization.

72378451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18052.

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

The square root of 72378451 is about 8507.5525857911. The cubic root of 72378451 is about 416.7443891990.

The spelling of 72378451 in words is "seventy-two million, three hundred seventy-eight thousand, four hundred fifty-one".