78672151 has 4 divisors (see below), whose sum is σ = 78707704. Its totient is φ = 78636600.

The previous prime is 78672133. The next prime is 78672163. The reversal of 78672151 is 15127687.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78672151 - 2¹⁹ = 78147863 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 78672151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78672851) 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, 14220 + ... + 18961.

It is an arithmetic number, because the mean of its divisors is an integer number (19676926).

Almost surely, 2^78672151 is an apocalyptic number.

78672151 is a deficient number, since it is larger than the sum of its proper divisors (35553).

78672151 is a wasteful number, since it uses less digits than its factorization.

78672151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35552.

The product of its digits is 23520, while the sum is 37.

The square root of 78672151 is about 8869.7322958475. The cubic root of 78672151 is about 428.4896552607.

The spelling of 78672151 in words is "seventy-eight million, six hundred seventy-two thousand, one hundred fifty-one".